The Application of the Neugebauer Equations to Electronic Color Correction.

All areas within the color gamut of a copy to be reproduced rarely fall within the color gamut of the printing inks. A change in dominant wave-lengths, purity, or Iuminance is performed by the photoengraver in an interpretation of the subject. The operator of the RCA All Electronic Color Corrector produces the same changes by means of varying the terms in the Neugebauer equations. These terms are varied by changing knobs on a computer panel and observing results on meters which indicate black, cyan, magenta, and yellow percent ink dot. This paper will present a review of the RCA Electronic Color Correction process and the basic principles underlying tne Neugebauer equations. Ink charts placed about the border of a subject provide the means by which the operator obtains the terms in the Neugebauer equations, thus establishing the printing ink gamut. Methods and examples of changing the computed ink dot values when colors fall out of the ink gamut will be presented.