公开(公告)号：US3718397A

公开(公告)日：1973-02-27

申请号：US3718397D

申请日：1971-05-14

Applicant: UNILUX GRAPHICS INC

Inventor： SMAJO J

IPC: G01J1/14 ,  G03B27/72 ,  G03B27/04

CPC classification number: G01J1/14 ,  G03B27/72

Abstract: A step-wedge is reprinted four times, one for each of three colors plus black and white as a mask. The reprinting is in a different position each time, giving a total of four different positions with one selected value overprinted by each color to show the effect of the overprint, namely to demonstrate a neutral. If a neutral gray is obtained, then it is known that the printing is correct. If no neutral is obtained, a ready reference, not requiring the use of a densitometer or separation filters is immediately at hand.

Abstract translation: 四分之一片重新印刷四次，一种为三种颜色之一，加上黑色和白色作为面具。 每次转印都处于不同的位置，总共提供四个不同的位置，其中一个选定的值由每种颜色打印，以显示叠印的效果，即展示中性。 如果获得中性灰色，则知道打印正确。 如果没有获得中性，就可以立即提供不需要使用密度计或分离过滤器的现成参考。