Originally Posted by
Robert A. Zeichner
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In photography we deal with light of different intensities and colors of different hues and saturations. All these things are what we perceive when we observe a subject in real life. Film is designed to capture these attributes in a constantly variable fashion. The intensity of the light will determine the density of the negative, which will in turn determine the tones reproduced on the final print (subject to our darkroom manipulations, of course). The negative density is analagous to the original subject.
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