| Architectural PhotographsAll 
                    the photographs below are for sale. 
MODERN 
                    CHURCH TOWER by 
                    A.K. Hayward 0.490 x 0.360
BOLTON 
                    ABBEY by 
                    Anon 0.190 x 0.280
STRASBURG 
                    CATHEDRAL by 
                    Anon 0.260 x 0.210
JAMIEGES 
                    ABBEY by 
                    Anon 0.280 x 0.220
HEIDELBERG 
                    CASTLE by 
                    Anon 0.220 x 0.280
FOUNTAINS 
                    ABBEY (From the West) by 
                    Anon 0.190 x 0.290
TONBRIDGE 
                    CASTLE by 
                    Anon 0.190 x 0.290
BAYEAUX 
                    CATHEDRAL by 
                    N.P. Facy 0.340 x 0.400
TUMMEL 
                    GARRY DAM by 
                    Anon 0.310 x 0.380
REYNOLDS 
                    METAL BUILDING, DETROIT, MICHIGAN architect MINORU YAMASAKI 
                    by 
                    Anon 0.250 x 0.200I 
                    have a group of 9 images if this building
ABSTRACT 
                    1by 
                    Gordon Bird 0.500 x 0.480I 
                    have a collection of over 80 abstract photographs by this 
                    artist
ABSTRACT 
                    2By 
                    Gordon Bird 0.500 x 0.480I 
                    have a collection of over 80 abstract photographs by this 
                    artistPhotography is the process of making pictures 
                    by means of the action of light. Light patterns reflected 
                    or emitted from objects are recorded onto a sensitive medium 
                    or storage chip through a timed exposure. The process is done 
                    through mechanical, chemical or digital devices known as cameras. Photography
 The word comes from the Greek words phos ("light"), 
                    and graphis ("stylus", "paintbrush") or 
                    graphê, together meaning "drawing with light" 
                    or "representation by means of lines" or "drawing." 
                    Traditionally the product of photography has been called a 
                    photograph. The term photo is an abbreviation; many people 
                    also call them pictures. In digital photography, the term 
                    image has begun to replace photograph. (The term image is 
                    traditional in geometric optics.
 Photographic image-forming devices
 Most commonly a camera or camera obscura is the image forming 
                    device and photographic film or a digital storage card is 
                    the recording medium, although other methods are available. 
                    For instance, the photocopy or xerography machine forms permanent 
                    images but uses the transfer of static electrical charges 
                    rather than photographic film, hence the term electrophotography. 
                    The rayographs published by Man Ray in 1922 are images produced 
                    by the shadows of objects cast on the photographic paper, 
                    without the use of a camera. Objects can be placed directly 
                    on the glass of a scanner to produce pictures digitally.
 Photographers control the camera to expose the light recording 
                    material (usually film or a charge-coupled device) to the 
                    required amount of light. After processing, this produces 
                    an image whose contents are acceptably sharp, bright and composed 
                    to achieve the objective of taking the photograph.
 The controls include:
 Focus
 Aperture of the lens (amount of light allowed to pass through 
                    the lens)
 Duration of exposure (or shutter speed)
 Focal length and type of lens (telephoto, macro, wide angle, 
                    or zoom)
 Sensitivity of the medium to light intensity and color/wavelength
 Filters, scrims, or other special effects that may be placed 
                    between the subject and the light recording material, either 
                    in front of or behind the lens
 The nature of the light recording material itself, for example 
                    its resolution as measured in pixels or "grains" 
                    of silver halide,
 The controls are inter-related, as the total amount of light 
                    reaching the film plane (the "exposure") changes 
                    proportionately with the duration of exposure, aperture of 
                    the lens, and focal length of the lens (which changes as the 
                    lens is focused, or if it is "zoomed"). Changing 
                    any of these will, therefore, alter the exposure. Many cameras 
                    will automatically adjust the aperture of the lens to account 
                    for changes in focus, and some will do so for changes in zoom 
                    as well.
 The duration of an exposure is referred to as the "shutter 
                    speed," often even in cameras that don't have a physical 
                    shutter, and is typically measured in fractions of a second. 
                    The aperture is expressed by an f-number or f-stop (derived 
                    from focal ratio), which is proportional to the ratio of the 
                    focal length to the diameter of the aperture. If the f-number 
                    is decreased by a factor of , the aperture diameter is increased 
                    by the same factor, and its area is increased by a factor 
                    of 2. The f-stops that might be found on a typical lens include 
                    2.8, 4, 5.6, 8, 11, 16, 22, 32, where going up "one stop" 
                    doubles the amount of light reaching the film, and "stopping 
                    down" one stop halves the amount of light.
 To achieve a given exposure, various combinations of shutter 
                    speed and aperture could be used. For example, f/8 at 1/125th 
                    of a second and f/4 at 1/500th of a second yield the same 
                    amount of light. However, the combination chosen impacts the 
                    final result. In addition to the subject or camera movement 
                    that might vary depending on the shutter speed, the aperture 
                    (and focal length of the lens) determine the "depth of 
                    field," which refers to the range of distances from the 
                    lens that will be considered in acceptable focus. For example, 
                    using a long lens and a large aperture (f/2.8, for example), 
                    such as might be used with a large format camera, a subject's 
                    eyes might be in sharp focus while the tip of the nose is 
                    noticeably blurred. If the aperture is made smaller (f/22), 
                    or a shorter lens is used, then both the subject's eyes and 
                    nose can be brought into focus at the same time. If a very 
                    small aperture is used, such as a pinhole, then a very wide 
                    range of distance can be brought into focus at once.
 Image capture is only part of the image forming process. Regardless 
                    of the light recording material used, some sort of process 
                    or processes must be employed to render the "latent image" 
                    captured by the camera into the final photographic work. This 
                    process consists of two steps, development, and printing. 
                    For people who do not do their own printing, these two steps 
                    are often considered the same step, "getting the pictures 
                    developed" is thought of as analgous to "getting 
                    the pictures printed", but they are separate steps.
 During the printing process, additional modifications can 
                    be made to the print via several controls. Many of these controls 
                    are analogous to controls during the time of capturing the 
                    image, and some of them are exclusive to the printing process. 
                    Most of these controls have equivalent concepts in the digital 
                    world, but in some cases the effect is not exactly the same. 
                    This difference between digital and film is especially pronounced 
                    for the dodging and burning controls.
 Chemicals and Process used during film development 
                    Duration of exposure (equivalent to shutter speed)
 Printing Aperture (equivalent to aperture, but has no effect 
                    on depth of field)
 Contrast
 Dodging (Localized reduction in duration of exposure, resulting 
                    in a lighter areas)
 Burning (Localized increase in duration of exposure, resulting 
                    in darker areas) Paper Quality (Gloss, Matte, Etc)
 Uses of photography
 Photography can be classified under imaging technology and 
                    has gained the interest of scientists and artists from its 
                    inception. Scientists have used its capacity to make accurate 
                    recordings, such as Eadweard Muybridge in his study of human 
                    and animal locomotion (1887). Artists have been equally interested 
                    by this aspect but have also tried to explore other avenues 
                    than the photo-mechanical representation of reality, such 
                    as the pictorialist movement. Military, police and security 
                    forces use photography for surveillance, recognition and data 
                    storage. Photography is used to preserve memories of favourites 
                    and as a source of entertainment.
 History of photography
 Chemical photography
 For centuries images have been projected onto surfaces. The 
                    camera obscura and the camera lucida were used by artists 
                    to trace scenes as early as the 16th century. These early 
                    cameras did not fix an image in time; they only projected 
                    what passed through an opening in the wall of a darkened room 
                    onto a surface. In effect, the entire room was turned into 
                    a large pinhole camera. Indeed, the phrase camera obscura 
                    literally means "darkened room," and it is after 
                    these darkened rooms that all modern cameras have been named.
 The first photograph is considered to be an image produced 
                    in 1826 by the French inventor Nicéphore Niépce 
                    on a polished pewter plate covered with a petroleum derivative 
                    called bitumen of Judea. It was produced with a camera, and 
                    required an eight hour exposure in bright sunshine. However 
                    this process turned out to be a dead end and Niépce 
                    began experimenting with silver compounds based on a Johann 
                    Heinrich Schultz discovery in 1724 that a silver and chalk 
                    mixture darkens when exposed to light.
 Niépce, in Chalon-sur-Saône, and the artist Louis 
                    Daguerre, in Paris, refined the existing silver process in 
                    a partnership. In 1833 Niépce died of a stroke, leaving 
                    his notes to Daguerre. While he had no scientific background, 
                    Daguerre made two pivotal contributions to the process. He 
                    discovered that by exposing the silver first to iodine vapour, 
                    before exposure to light, and then to mercury fumes after 
                    the photograph was taken, a latent image could be formed and 
                    made visible. By then bathing the plate in a salt bath the 
                    image could be fixed. In 1839 Daguerre announced that he had 
                    invented a process using silver on a copper plate called the 
                    Daguerreotype. A similar process is still used today for Polaroids. 
                    The French government bought the patent and immediately made 
                    it public domain.
 Across the English Channel, William Fox Talbot had earlier 
                    discovered another means to fix a silver process image but 
                    had kept it secret. After reading about Daguerre's invention 
                    Talbot refined his process, so that it might be fast enough 
                    to take photographs of people as Daguerre had done and by 
                    1840 he had invented the calotype process. He coated paper 
                    sheets with silver chloride to create an intermediate negative 
                    image. Unlike a daguerreotype a calotype negative could be 
                    used to reproduce positive prints, like most chemical films 
                    do today. Talbot patented this process which greatly limited 
                    its adoption. He spent the rest of his life in lawsuits defending 
                    the patent until he gave up on photography altogether. But 
                    later this process was refined by George Eastman and is today 
                    the basic technology used by chemical film cameras. Hippolyte 
                    Bayard had also developed a method of photography but delayed 
                    announcing it, and so was not recognized as its inventor.
 In 1851 Frederick Scott Archer invented the collodion process. 
                    It was this process that was used by the photographer and 
                    renowned children's author, Lewis Carroll.
 Slovene Janez Puhar invented the technical procedure for making 
                    photographs on glass in 1841. The invention was recognized 
                    on July 17th 1852 in Paris by the Académie Nationale 
                    Agricole, Manufacturière et Commerciale.
 Popularization
 The Daguerreotype proved popular in responding to the demand 
                    for portraiture emerging from the middle classes during the 
                    Industrial Revolution. This demand, that could not be met 
                    in volume and in cost by oil painting, may well have been 
                    the push for the development of photography. However daguerreotypes, 
                    while beautiful, were fragile and difficult to copy. A single 
                    photograph taken in a portrait studio could cost US$1000 in 
                    2006 dollars. Photographers also encouraged chemists to refine 
                    the process of making many copies cheaply, which eventually 
                    led them back to Talbot's process. Ultimately, the modern 
                    photographic process came about from a series of refinements 
                    and improvements in the first 20 years. In 1884 George Eastman, 
                    of Rochester, New York, developed dry gel on paper, or film, 
                    to replace the photographic plate so that a photographer no 
                    longer needed to carry boxes of plates and toxic chemicals 
                    around. In July of 1888 Eastman's Kodak camera went on the 
                    market with the slogan "You press the button, we do the 
                    rest". Now anyone could take a photograph and leave the 
                    complex parts of the process to others. Photography became 
                    available for the mass-market in 1901 with the introduction 
                    of Kodak Brownie. Since then color film has become standard, 
                    as well as automatic focus and automatic exposure. Digital 
                    recording of images is becoming increasingly common, as digital 
                    cameras allow instant previews on LCD screens and the resolution 
                    of top of the range models has exceeded high quality 35mm 
                    film while lower resolution models have become affordable. 
                    For the enthusiast photographer processing black and white 
                    film, little has changed since the introduction of the 35mm 
                    film Leica camera in 1925.
 Economic history
 In the nineteenth century, photography developed rapidly as 
                    a commercial service. End-user supplies of photographic equipment 
                    accounted for only about 20% of industry revenue.
 Given the development of new digital technologies for creating 
                    and sharing images, and of new communications devices, e.g. 
                    camera phones, understanding the economics of image use are 
                    becoming increasingly important for understanding the evolution 
                    of the communications industry as a whole.
 Resources
 Jenkins, Reese V. Images & Enterprise: Technology and 
                    the American Photographic Industry 1839-1925. Baltimore, The 
                    Johns Hopkins University Press, 1975. The book provides an 
                    overview of the economics of photography and the development 
                    of the Eastman Kodak Company.
 Photography types
 Colour photography
 Color photography was explored throughout the 1800s. Initial 
                    experiments in color could not fix the photograph and prevent 
                    the color from fading. The first permanent color photo was 
                    taken in 1861 by the physicist James Clerk Maxwell.
 One of the early methods of taking color photos was to use 
                    three cameras. Each camera would have a color filter in front 
                    of the lens. This technique provides the photographer with 
                    the three basic channels required to recreate a color image 
                    in a darkroom or processing plant. Russian photographer Sergei 
                    Mikhailovich Prokudin-Gorskii developed another technique, 
                    with three color plates taken in quick succession.
 Practical application of the technique was held back by the 
                    very limited color response of early film; however, in the 
                    early 1900s, following the work of photo-chemists such as 
                    H. W. Vogel, emulsions with adequate sensitivity to green 
                    and red light at last became available.
 The first color film, Autochrome, invented by the French Lumière 
                    brothers, reached the market in 1907. It was based on a 'screen-plate' 
                    filter made of dyed dots of potato starch, and was the only 
                    color film on the market until German Agfa introduced the 
                    similar Agfacolor in 1932. In 1935, American Kodak introduced 
                    the first modern ('integrated tri-pack') color film, Kodachrome, 
                    based on three colored emulsions. This was followed in 1936 
                    by Agfa's Agfacolor Neue. Unlike the Kodachrome tri-pack process 
                    the colour couplers in Agfacolor Neue were integral with the 
                    emulsion layers, which greatly simplified the film processing. 
                    Most modern color films, except Kodachrome, are based on the 
                    Agfacolor Neue technology. Instant color film was introduced 
                    by Polaroid in 1963.
 As an interesting side note, the inventors of Kodachrome, 
                    Leopold Mannes and Leopold Godowsky Jr. were both accomplished 
                    musicians. Godowsky was the brother-in-law of George Gershwin 
                    and his father was Leopold Godowsky, one of the world's greatest 
                    pianists.
 Color photography may form images as a positive transparency, 
                    intended for use in a slide projector or as color negatives, 
                    intended for use in creating positive color enlargements on 
                    specially coated paper. The latter is now the most common 
                    form of film (non-digital) color photography owing to the 
                    introduction of automated photoprinting equipment.
 Digital photography
 Having fun with photography: manipulation 
                    of the scanned print in a graphics program puts these two 
                    brave people on top of an Austrian cable car. Click on the 
                    picture to see the three pictures used.Traditional photography was a considerable burden for photographers 
                    working at remote locations (such as press correspondents) 
                    without access to processing facilities. With increased competition 
                    from television there was pressure to deliver their images 
                    to newspapers with greater speed. Photo-journalists at remote 
                    locations would carry a miniature photo lab with them and 
                    some means of transmitting their images down the telephone 
                    line. In 1981 Sony unveiled the first consumer camera to use 
                    a CCD for imaging, and which required no film -- the Sony 
                    Mavica. While the Mavica did save images to disk, the images 
                    themselves were displayed on television, and therefore the 
                    camera could not be considered fully digital. In 1990, Kodak 
                    unveiled the DCS 100, the first commercially available digital 
                    camera. Its cost precluded any use other than photojournalism 
                    and professional applications, but commercial digital photography 
                    was born.
 Digital photography uses an electronic sensor such as a charge-coupled 
                    device to record the image as a piece of electronic data rather 
                    than as chemical changes on film. Some other devices, such 
                    as cell phones, now include digital photography features.
 Although not viewed by all photographers as true photography, 
                    digital photography in fact meets all requirements to be called 
                    such. Even though there are no chemical processes, a digital 
                    camera captures a frame of whatever it happens to be pointed 
                    at, which can be viewed later. In 10 years, digital point 
                    and shoot cameras have become widespread consumer products. 
                    These digital cameras now outsell film cameras, and many include 
                    features not found in film cameras such as the ability to 
                    shoot video and record audio.
 Kodak announced in January 2004 that it would no longer produce 
                    reloadable 35mm cameras after the end of that year. This was 
                    interpreted as a sign of the end of film photography. However, 
                    Kodak was at that time a minor player on the reloadable film 
                    cameras market. In January 2006 Nikon followed suit and announced 
                    that they will stop the production of all but two models of 
                    their film cameras, they will continue to produce the low-end 
                    Nikon FM10, and the high-end Nikon F6. On May 25, 2006 Canon 
                    announced they will stop developing new film SLR cameras. 
                    The price of 35mm and APS compact cameras have dropped, probably 
                    due to direct competition from digital and the resulting growth 
                    of the offer of second-hand film cameras.
 Ethical concerns arise when discussing digital photography. 
                    Many photojournalists have moral reasonings not to crop photos 
                    and are forbidden from combining elements of multiple photos 
                    to make "illustrations," passing them as real photographs 
                    (for example, the photo above of the two men on the cable 
                    car). Many courts will not accept digital photographs as evidence 
                    as they are easily modified. Today's technology have made 
                    picture editing relatively easy for even the novice photographer. 
                    While photography editing software may raise ethical issues, 
                    even beginners can easily edit color, contrast, exposure and 
                    sharpness with the click of a mouse, whereas those same procedures 
                    would have taken an extensive amount of time in a traditional 
                    darkroom.
 Digital versus film
 There is debate over which of the two formats, digital or 
                    film, is superior. It cannot be said that either of the formats 
                    is superior to the other in every way. Rather, each of the 
                    formats has its own specific advantages. This section discusses 
                    those points.
 Quality
 There are numerous measures which can be used to assess the 
                    quality of still photographs. The most discussed of these 
                    is spatial resolution, i.e. the number of separate points 
                    in the photograph. This is measured by how many millions of 
                    picture cells make up the photo.
 The comparison of resolution between film and digital photography 
                    is complex. Measuring the resolution of both film and digital 
                    photographs depends on numerous issues. For film, this issue 
                    depends on the size of film used (35mm, Medium format or Large 
                    format), the speed of the film used and the quality of lenses 
                    in the camera. Additionally, since film is an analogue medium, 
                    it does not have pixels so its resolution measured in pixels 
                    can only be an estimate.
 Similarly, digital cameras rarely perform to their stated 
                    megapixel count. Other factors are important in digital camera 
                    resolution such as the actual number of pixels used to store 
                    the image, the effect of the Bayer pattern of sensor filters 
                    on the digital sensor and the image processing algorithm used 
                    to interpolate sensor pixels to image pixels. In addition, 
                    digital sensors are generally arranged in a rectangular pattern, 
                    making images susceptible to moire pattern artifacts, whereas 
                    film is immune to such effects due to the random orientation 
                    of grains.
 Estimates of the resolution of a photograph taken with a 35mm 
                    film camera vary. However, there exist many estimates around 
                    12 Megapixels (4K). It is possible for more resolution to 
                    be recorded if, for example, a finer-grain film is used or 
                    less resolution to be recorded with poor quality optics or 
                    low light levels. This would place 35mm film cameras roughly 
                    equivalent with top-of-the-range digital cameras (as of 2006).
 However, while 35mm is the standard format for consumer cameras, 
                    many professional film cameras use Medium format or Large 
                    format films which, due to the size of the film used, can 
                    boast resolution many times greater than the current top-of-the-range 
                    digital cameras. For example, it is estimated that a medium 
                    format film photograph can record around 50 Megapixels, while 
                    a Large format films can record around 200 Megapixels (4x5 
                    inch) which would equate to around 800 Megapixels on the largest 
                    common film format, 8x10 inch.
 The resolution of modern black and white slow speed film, 
                    exposed through a high quality prime lens working at its optimum 
                    aperture yields usable detail at a scanned file size of greater 
                    than 30 megapixels. With consumer 35mm color negative film 
                    an effective resolution of over 12 megapixels is achievable 
                    and in an inexpensive 35mm point and shoot camera a resolution 
                    of over 8 megapixels may be achieved.
 When deciding between film and digital and between different 
                    types of camera, it is necessary to take into account the 
                    medium which will be used for display. For instance, if a 
                    photograph will only be viewed on a television or computer 
                    display (which can resolve only about 2 Megapixels and 1.3 
                    Megapixels, respectively, as of 2006), then the resolution 
                    provided by a low-end digital cameras may be sufficient. For 
                    standard 4x6 inch prints, it is debatable whether there will 
                    be any perceived quality difference between digital and film. 
                    If the medium is a large billboard, then it is likely that 
                    the extra resolution of a medium or large format will be necessary. 
                    For larger prints, the extra resolution of a good 35mm film 
                    photograph may be desirable.
 It should be noted that a special case exists for long exposure 
                    photography - Currently available technology contributes random 
                    noise to the images taken by digital cameras, produced by 
                    thermal noise and manufacturing defects. For very long exposures 
                    it is necessary to operate the detector at low temperatures 
                    to avoid noise impacting the final image. Film grain is not 
                    affected by exposure time, although the apparent speed of 
                    the film does change with longer exposures.
 Convenience and Flexibility
 This has been one of the major drivers of the widespread adoption 
                    of digital cameras. Before the advent of digital cameras, 
                    once a photograph was taken, the roll of film would need to 
                    be finished and sent off to a lab to be developed. Only once 
                    the film was returned was it possible to see the photograph. 
                    However, most digital cameras incorporate an LCD screen which 
                    allows the photograph to be viewed immediately after it has 
                    been taken. This allows the photographer to delete unrequired 
                    photographs and offers an immediate opportunity to re-take. 
                    When a user desires prints, it is only necessary to print 
                    the good photographs.
 Another major advantage of digital technology is that photographs 
                    can be conveniently moved to a personal computer for modification. 
                    Many digital cameras are capable of storing pictures in a 
                    RAW format which stores the output from the sensor directly 
                    rather than processing it immediately to an image. When combined 
                    with suitable software, such as dcraw, this allows the user 
                    to configure certain parameters of the taken photograph (such 
                    as sharpness or colour) before it is "developed" 
                    into a final image. More sophisticated users may choose to 
                    manipulate or alter the actual content of the recorded image.
 Film photographs may be digitised in a process known as scanning. 
                    They may then be manipulated as digital photographs.
 Price
 The two formats (film and digital) have different emphases 
                    as regards pricing. With digital photography, cameras tend 
                    to be significantly more expensive than film ones, comparing 
                    like for like. This is offset by the fact that taking photographs 
                    is effectively cost-free. Photographs can be taken freely 
                    and copies distributed over the internet free of charge.
 This should be contrasted with film photography where good-quality 
                    cameras tend to be less complicated and, therefore, less expensive. 
                    But this is at the expense of ongoing costs both in terms 
                    of film and processing costs. In particular, film cameras 
                    offer no chance to review photographs immediately after they 
                    are shot, and all photos taken must be processed before knowing 
                    anything about the quality of the final photograph.
 There are costs associated with digital photography. Digital 
                    cameras use batteries, some of which are proprietary and quite 
                    expensive. While they are rechargable, they do degrade over 
                    time and must be periodically replaced. Although there is 
                    no film in digital cameras, there is the requirement to store 
                    the images on memory cards or microdrives which also have 
                    limited life. Additionally, some provision for storage of 
                    the digital image must be made. In general this would be either 
                    an optical disc produced by a shop or photofinisher, or by 
                    the photographer on a computer system. If physical prints 
                    are to be made they can either be purchased from a photofinisher, 
                    or produced by the photographer.
 The price differential between the two formats is often dictated 
                    by the intent of the photographer and the purpose of his or 
                    her work.
 Robustness
 Nonetheless film still has advantages over digital, at least 
                    with current technology. One of the main advantages is its 
                    latitude, that is, the ability to produce a good image from 
                    over- or underexposed negatives. Digital images which are 
                    slightly overexposed can lose all data in the highlights, 
                    and underexposed digital will lose significant shadow detail. 
                    Film, on the other hand, can be greatly over- or underexposed 
                    and still be able to produce a normal image. This is especially 
                    true with black and white film.
 Dust on the image plane is a constant issue for photographers. 
                    Digital cameras are especially prone to dust problems because 
                    the sensor is static, whereas film is always being replaced. 
                    For digital SLRs the presence of dust is often difficult to 
                    rectify. With film cameras dust is easy to manage through 
                    the use of good technique and clean handling methods. Some 
                    digital SLRs however, have rectification mechanisms which 
                    detect the dust particles on the image sensor and selectively 
                    ignore them to a certain degree therefore making them more 
                    manageble.
 Archiving
 When choosing between film and digital formats, it is necessary 
                    to consider the suitability of each as an archival medium.
 Films and prints processed and stored in ideal conditions 
                    have demonstrated an ability to remain substantially unchanged 
                    for more than 100 years. Gold or platinum toned prints probably 
                    have a lifespan limited only by the lifespan of the base material, 
                    probably many hundreds of years.
 The archival potential of digital photographs is less well 
                    understood since digital media have existed for only the last 
                    50 years. There exist three problems which must be overcome 
                    for archival usage: physical stability of the recording medium, 
                    future readability of the storage medium and future readability 
                    of the file formats used for storage.
 Many digital media are not capable of storing data for prolonged 
                    periods of time. For example, magnetic disks and tapes may 
                    lose their data after twenty years, flash memory cards even 
                    less. Good quality optical media may be the most durable storage 
                    media for digital data.
 It is important to consider the future readability of storage 
                    media. Assuming the storage media can continue to hold data 
                    for prolonged periods of time, the short lifespan of digital 
                    technologies often causes the drives to read media to become 
                    unavailable. For example, the first 5¼-inch Floppy 
                    disks were first made available in 1976. However, the drives 
                    to read them are already extremely rare just 30 years later.
 It must also be considered whether there still exists software 
                    which can decode the data. For example, many modern digital 
                    cameras save photographs in JPEG format. This format has existed 
                    for only around 15 years. Whether it will still be readable 
                    in a century is unknown.
 Most professional cameras can save in a RAW image format, 
                    the future of which is much more uncertain. Some of these 
                    formats contain proprietary data which is encrypted or protected 
                    by patents, and could be abandoned by their makers at any 
                    time for simple economic reasons. This could make it difficult 
                    to read these 'raw' files in the future, unless the camera 
                    makers were to release information on the file formats.
 However, digital archives have several methods of overcoming 
                    such obstacles. In order to counteract the file format problems, 
                    many organizations prefer to choose an open and popular file 
                    format. Doing so increases the chance that software will exist 
                    to decode the file in the future.
 Additionally many organisations take an active approach to 
                    archiving rather than relying on formats being readable decades 
                    later. This takes advantage of the ability to make perfect 
                    copies of digital media. So, for example, rather than leaving 
                    data on a format which may potentially become unreadable or 
                    unsupported, the information can typically be copied to newer 
                    media without loss of quality. This is only possible with 
                    digital media.
 Integrity
 Film produces a first generation image, which contains only 
                    the information admitted through the aperture of the camera. 
                    Film "sees" in color, in a specific spectral band 
                    such as Orthochromatic, or in broad Panchromatic sensitivity. 
                    Differences in Development technique can produce subtle changes 
                    in the finished Negative or Positive, but once this process 
                    is complete it is considered permanent.
 Film images are very difficult to fabricate, thus in law enforcement 
                    and in cases where the authenticity of an image is important 
                    (Passport/Visa photographs), film provides greater security 
                    over digital, which has the disadvantage that photographs 
                    can be conveniently moved to a personal computer for modification.
 Photography styles
 Commercial photography
 The commercial photographic world can be broken down to:
 Advertising photography: photographs made to illustrate a 
                    service or product. These images are generally done with an 
                    advertising agency, design firm or with an in-house corporate 
                    design team.
 Editorial photography: photographs made to illustrate a story 
                    or idea within the context of a magazine. These are usually 
                    assigned by the magazine.
 Photojournalism: this can be considered a subset of editorial 
                    photography. Photographs made in this context are accepted 
                    as a truthful documentation of a news story.
 Portrait and wedding photography: photographs made and sold 
                    directly to the end user of the images.
 Fine art photography: photographs made to fulfill a vision, 
                    and reproduced to be sold directly to the customer.
 The market for photographic services demonstrates the aphorism 
                    "one picture is worth a thousand words," which has 
                    an interesting basis in the history of photography. Magazines 
                    and newspapers, companies putting up Web sites, advertising 
                    agencies and other groups pay for photography.
 Many people take photographs for self-fulfillment or for commercial 
                    purposes. Organizations with a budget and a need for photography 
                    have several options: they can assign a member of the organization, 
                    hire someone, run a public competition, or obtain rights to 
                    stock photographs.
 Photography as an art form
 During the twentieth century, both fine art photography and 
                    documentary photography became accepted by the English-speaking 
                    art world and the gallery system. In the United States, a 
                    small handful of curators spent their lives advocating to 
                    put photography in such a system, with Alfred Stieglitz, Edward 
                    Steichen, John Szarkowski, and Hugh Edwards the most prominent 
                    among them.
 The aesthetics of photography is a matter that continues to 
                    be discussed regularly, especially in artistic circles. Many 
                    artists argued that photography was the mechanical reproduction 
                    of an image. If photography is authentically art, then photography 
                    in the context of art would need redefinition, such as determining 
                    what component of a photograph makes it beautiful to the viewer. 
                    The controversy began with the earliest images "written 
                    with light": Nicéphore Niépce, Louis Daguerre, 
                    and others among the very earliest photographers were met 
                    with acclaim, but some questioned if it met the definitions 
                    and purposes of art.
 Clive Bell in his classic essay "Art" states that 
                    only one thing can distinguish art from what is not art: "significant 
                    form." Bell wrote: "There must be some one quality 
                    without which a work of art cannot exist; possessing which, 
                    in the least degree, no work is altogether worthless. What 
                    is this quality? What quality is shared by all objects that 
                    provoke our aesthetic emotions? What quality is common to 
                    Sta. Sophia and the windows at Chartres, Mexican sculpture, 
                    a Persian bowl, Chinese carpets, Giotto's frescoes at Padua, 
                    and the masterpieces of Poussin, Piero della Francesca, and 
                    Cezanne? Only one answer seems possible - significant form. 
                    In each, lines and colors combined in a particular way, certain 
                    forms and relations of forms, stir our aesthetic emotions."
 Aesthetic realism and photography
 Others have since examined if this criterion be applied to 
                    photography. This question has been examined by the aesthetic 
                    realism understanding of beauty.
 A form of art in photography is that of portrait photography. 
                    A portrait is the rendering of someone's likeness. A portrait 
                    photographer not only wants to capture the true likeness, 
                    but also the personality of the individual. The photographer 
                    needs to be proficient not only in the workings and setting 
                    of the camera, but also needs to understand form and lighting. 
                    Great lighting and positioning can make someone appear at 
                    their best form if used correctly.
 VINTAGE PHOTOGRAPH DEALERS SIDEROTYPE Gold Printing Services: The new chrysotype process is an 
                    archival method of producing photographic images and/or text 
                    on handmade paper, with no fading or deterioration over hundreds 
                    of years.We can produce a new chrysotype print from any existing image 
                    or text, in muted shades of black, blue, green, violet, red 
                    or pink. Special applications include artists' portfolios, 
                    gallery exhibitions, sacred texts and document/photograph 
                    archives.
 ALLSWORTH 
                    BOOKS Allsworth Rare Books was established in 2002 by Jenny Allsworth, 
                    after ten years' experience working at major London booksellers 
                    (Bernard Quaritch Ltd., Henry Sotheran Ltd. and Bernard Shapero). 
                    We specialise in fine travel books and nineteenth century 
                    photographs, with a particular emphasis on Africa and the 
                    Far East. PIERRE 
                    SPAKE This site will offer for sale 19th century Photographs, and 
                    Books, Manuscripts, Ephemera from all dates. Now you have found me - sorry there is not that much to see 
                    at present. This site is due for a major injection of stock 
                    - but not quite yet. Bookmark and come back soon.
 ART 
                    75 PHOTOGRAPHIES XIXs et XXs and VINTAGE PHOTOGRAPHS 19th & 
                    20th century  LINUS 
                    CARR Linus Carr : Art Image Culture selling vintage photographs, 
                    original film, documents, art, ethnography PAUL 
                    FRECKER The internet has become an important medium in which to buy 
                    and sell photographic images. However, a scan can only give 
                    a potential buyer an idea of whether or not an image is appealing. 
                    It cannot compare with the experience of seeing and handling 
                    the actual photograph. A photograph is an object and it has 
                    a physical presence which is not conveyed on a website. For 
                    this reason, no sales are final, and if you find that your 
                    new acquisition does not match your expectations when it arrives, 
                    I offer a full, unconditional refund, less the cost of postage. ORDINARY 
                    LIGHT Our aim is to explore the history of photography in all its 
                    facets without segregation of high prices and occasional high 
                    brow posturing. We are always looking for photographs that 
                    do not necessarily cater to a well-developed bank account. 
                    We believe that the photography in all its forms should be 
                    democratic and accessible to the small collector as well as 
                    the fine art collector. We try to reflect this ideology by 
                    buying and selling photographs that have a particular affliction 
                    to the history of the medium. We do not shun expensive and 
                    well -known maker photographs either. We would like our potential 
                    audience to be wide ranging. As collectors of snapshots and 
                    other related photographic vernacular, we see the importance 
                    of the small things and perhaps things looked over. That is 
                    not say that we will not post more expensive pieces, it simply 
                    means that we will continue to sell all formats and distinctions 
                    of the photographic medium. IAN 
                    SUMNER PHOTOGRAPHY Please take a look around my website, view my services and 
                    a small sample from my portfolio. If you have any questions 
                    about you have seen or read then please get in touch.I am always interested in purchasing photographs, albums and 
                    good quality photographic books. You can meet me at the regular 
                    London Photograph Fair held at the Bonnington Hotel, Bloomsbury, 
                    in February, May, September and November each year.
 WOODSTONE 
                    ANTIQUES Woodstone Antiques and Collectables, selling Vintage Photographica, 
                    Optical Toys, Magic Lanterns, Stereo, Scientific, Bakelite 
                    and Unusual Items. VERDEAU
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