Photos

A photograph (often shortened to photo) is an image (or a representation of that on e.g. paper) created by collecting an array of photons onto special photo-sensitive paper. more...

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The most common photographs are those created of reflected visible wavelengths, producing permanent records of what the human eye can see.

Most photographs are made with a camera, which focuses the light onto either photographic film or a CCD or CMOS image sensor. Photographs can also be made by placing objects on photosensitive paper and exposing it to light (the result is often called a photogram) or by placing objects on the platen of a flatbed scanner (see scanner art).

History and special effects

Most traditional photographs are produced with a two-step chemical process. In the two-step process the film holds a negative image (colours and lights/darks are inverted), which is then transferred onto photographic paper as a positive image. Another widely used film is the positive film used for producing transparencies, usually mounted in cardboard or plastic frames called slides. Slides are widely used by professionals mostly due to their sharpness and accuracy of colour rendition. Most photographs published in magazines are still originally taken on colour transparency film.

Originally all photographs were black-and-white if not hand-painted in color. Although methods for developing color photos were available as early as the late 19th century, they did not become widely available until the 1940s or 50s, and even so, until the 1960s most photographs were taken in black and white. Since then, color photography has dominated popular photography, although the black and white format remains popular for amateur photographers and artists. Black and white film is considerably easier to develop than colour.

Panoramic format Images can be taken by using special cameras like the Hasselblad Xpan on standard film. Since the 1990s, panoramic photos have been relatively easy for the general population to take on Advanced Photo System film. APS was developed by several of the major film manufacturers to provide a "smart" film with different formats and computerized options available, though APS panoramas were created using a mask in panorama-capable cameras, far less desirable than a true panoramic camera which achieves its effect through wider film format. As with many past ideas in consumer film formats, APS has become less popular and will be discontinued in the near future.

Digital photos can be stored in various file formats, of which JPEG is one of the most popular. Many other graphic formats are used, including TIFF, GIF, TGA and RAW.

Read more at Wikipedia.org