A Spectral Improved Neugebauer Equation Model

Abstract

Neugebauer equations are the basic formula in color printing. However, this is a theoretical model. If the printing conditions and complexity of overprinting are not considered, the result obtained by Neugebauer equations will not be very accurate. The Neugebauer equations need to be corrected in practice. There are some methods such as Yule-Nielson correction, Cellular correction, dot gain correction and so on. In order to improve the precision and analyze the cause of errors of Neugebauer equations, a model using a spectral dot gain correction is given in the paper. The dot gain is generally a function of wavelength. Dot gain in each wavelength of a primary is treated in calculating the Demichel equations, and the corrected dot area is used as weighting factors in two color overprint and three color overprint process. The experiment and calculation show that this method can improve the precision of the equations a lot.