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Photography is the process of recording pictures by means of capturing
light on a light-sensitive medium, such as a film or electronic sensor.
Light patterns reflected or emitted from objects expose a sensitive silver
halide based chemical or electronic medium during a timed exposure,
usually through a photographic lens in a device known as a camera that
also stores the resulting information chemically or electronically.
** Photography types
- Black-and-white photography
All photography was originally monochrome, or black-and-white. Even after
color film was readily available, black-and-white photography continued
to dominate for decades, due to its lower cost and its "classic" photographic look.
In modern times, black-and-white has mostly become a minority art form, and most
photography has become color photography.
- Color photography
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.
- Digital photography
Digital imaging uses an electronic image sensor to record the image as a set of
electronic data rather than as chemical changes on film. The primary difference
between digital and chemical photography is that analog photography resists
manipulation because it involves film, optics and photographic paper, while digital
imaging is a highly manipulative medium. This difference allows for a degree of
image post-processing that is comparatively difficult in film-based photography,
permitting different communicative potentials and applications.
*** Photography styles
- Commercial photography
- Photography as an art form
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