In process-color reproduction, a photomechanical method using equipment and special filters to control or modulate color contrast and detail over the total area of each separation negative used for printed color reproduction. Masking is used primarily to reduce the contrast of transmitted light so that maximum reproductive value for reflected light can be attained. It is also used to heighten contrast when this quality is lacking in the transparency. Photographic masks may be either positive or negative, depending on the desired correction.

Special-effects procedure involving high-contrast film and multi-exposure techniques.

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