| 摘要 |
A method of reproducing polychromatic picture originals employs the continuous comparison of color separation voltages derived by means of an interposed color separation filter system and extraction of the smallest voltage at any one time of the color signal voltages for producing a white separation. The white separation is superimposed on the color separation as a mask, preferably a highlight mask, wherein only those portions of the white separation voltage which exceed a predetermined threshold value are utilized for the highlight mask. The white separation may also advantageously be employed in the reproduction of negative picture originals as a negative black separation.
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