Photography is the art, science and practice of creating
durable images by recording light or other electromagnetic radiation, either
electronically by means of an image sensor or chemically by means of a
light-sensitive material such as photographic film. Photography has many uses
for business, science, manufacturing (e.g. photo lithography), art, and
recreational purposes.Typically, a lens is
used to focus the light reflected or emitted from objects into a real image on
the light-sensitive surface inside a camera (film or digital sensor) during a
timed exposure.
In film photography,the result in a photographic emulsion is
an invisible latent image, which is later chemically developed into a visible
image, either negative or positive depending on the purpose of the photographic
material and the method of processing. A negative image on film is
traditionally used to photographically create a positive image on a paper base,
known as a print, either by using an enlarger or by contact printing.
In digital photography
the result in an electronic image sensor is an electrical charge at each pixel,
which is electronically processed and stored in a digital image file for
subsequent display or processing.
[Wikipedia]
