Study on the Offset Reproduction Tri-dimentional Study on the Offset Reproduction

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  • オフセット多色複製に関する研究
  • オフセット タショク フクセイ ニ カンスル ケンキュウ

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Abstract

Color patches were printed in offset lithography using deep-etched plate, and the colors were measured by spectrophotometer. The measured values were arranged in a tridimensional space formed on the axis of the chromaticity coordinates x and y and the Munsell value of VY.<br>It was observed that the sample colors of 73 in all were formed a hexahedron in this space, and that the six faces of this hexahedron clearly defined the limit of the reproduced color gamut.<br>From the observation and analysis of this color space, it is known that the colors produced by halftone process can de treated as a vector field.<br>Using this tridimensional system, one can easyily illustrate and predict secondary colors (over print of two primary colors) and tertially color (overprint of three primary colors).<br>The study of this hexahedron of colors reveals the theoretical significance of the black printer and the tint color printers that supplement primary colors.<br>Also, such a study provides instructions concerning to the selection of primary that can be used in printing reproductions.

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