Importance

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Abstract

The reproduction of one or more target colors on photographic media directly by use of a light source and a selected group of color filters, such as for preparation of a multi-color pre-press color proof, each of the target colors being reproduced by: (a) illuminating the target color with the given light source or equivalent thereof and determining the proportion of the three primary colors which constitute said target color by comparing the target color to a color reference data base comprising a plurality of colors constituted of said primary colors under illumination by a like light source whereby to select from said data base a reference color most similar to the target color and thereby identify a group of one or more color filter elements usable to reproduce the reference color; (b) determining the exposure time of each color filter element required substantially to reproduce the reference color and thus the target color on the color sensitive photographic material when developed; (c) exposing undeveloped color sensitive photographic material through each color filter element for a period corresponding to the exposure time thus determined for each respective color filter element; and (d) developing the exposed color sensitive photographic material thereby substantially to reproduce the target color thereon.

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First Claim