tonal distortion

Definition: Property of image in which contrast, range of brightness, or colours appear to be markedly different from that of subject. * It can be caused by wide factors including - for black and white e.g. (1) use of special effects filters; unconventional processing (2) over- or under-development (3) use of contrast grade not matched to contrast of negative (4) reciprocity failure, etc; for colour films, in addition to above, (1) use of light-source not balanced for film (2) reciprocity failure of colour balance (3) unconventional filtration during printing, etc.

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