To
produce the desired density in the final image Photographic
materials ( film,
paper or CCDs) need
to be exposed to a specific amount of light. Too much
light and the receptor is over exposed - too little
and it is underexposed -
In each
case ( under or over exposure) visual information
from the scene is lost.
So Exposure refers to the amount
of light a light sensitive material like film, photographic
paper or a CCD receives.
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