Color Correction for the Digital Color Printer

Abstract

The Neugebauer equations are well known to figure out the color reproduction value of printed materials. These equations are supposed to be theoretically applied to the color reproduction of the RICOH digital color printer output. However, since these equations were very complicated to solve, we used the approximate solutions for color correction process instead.
We handled reflectances as input and fractional dot areas as output in the color correction process. In this case, the approximate value of cyan and magenta was very accurate and close to the targeted value, however, the value of yellow was not acceptable. We resolved the Neugebauer equations concerning yellow by using approximate value of cyan and magenta. As a result, the value of yellow was acceptable as well as cyan and magenta.
In case of handling original densities as input and handling either toner densities or fractional dot areas as output, the color correction process was relatively successful by using the approximate value of cyan, magenta and yellow. Therefore, it was shown that the color correction process like conventional one could be applied even to the digital color printer.