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Friday 23 March 2012
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Photography
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
. 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
during a timed
exposure
. 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. 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
.
Photography has many uses for business, science, manufacturing (e.g.
photolithography
), art, and recreational purposes.
KOVAI KUTTRALAM
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