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Proceedings Paper

Gray Component Replacement by the Neugebauer Equations
Author(s): Chiho Nakamura; Kazuo Sayanagi
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Paper Abstract

The Neugebauer equations give us a set of dot areas to reproduce a given target color( X, Y, Z ) as solutions of non-linear simultaneous equations, not only in case of three color reproduction but also four color one. We have only three equations, therefore one dot area has to be fixed prior to solve the Neugebauer equations. The way to apply black printers could be classified into varieties, according to how to fix one dot area among four ink dot areas. Conventional black printer given by black rate with minimum dot area in three color reproduction, maximum black in which one of three colors is zero and skeleton black to avoid black dots for high-light are discussed in this paper. Studies give us clear view on the black printer applications in different manners and results are summarized as restatements of concepts and redefinitions of technical terms. Almost technical terms used in past related with black printers explain well local photographic processes which were used before digital handling as continuous tone color separation. Now in modern processing of color information, it is not necessary to hold simulation of photographic image treatments. Relation between target tristimulus values and four dot areas is directly given by the Neugebauer equations.

Paper Details

Date Published: 12 June 1990
PDF: 14 pages
Proc. SPIE 1184, Neugebauer Memorial Seminar on Color Reproduction, (12 June 1990); doi: 10.1117/12.963897
Show Author Affiliations
Chiho Nakamura, Shaken Information Media Laboratory (United States)
Kazuo Sayanagi, Shaken Information Media Laboratory (United States)

Published in SPIE Proceedings Vol. 1184:
Neugebauer Memorial Seminar on Color Reproduction
Kazuo Sayanagi, Editor(s)

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