Details:
Summary:
The need for a color test object that guides the basic color correction adjustments of the electronic color separation scanner provides a starting point for study. The scope of this need, including differences in original photographic color materials, different process ink colorants and differences in the red, green, and blue responses of the various color scanners has been identified as variables. A three-element test object evolved from a detailed analysis of this need: A selective neutral scale based on visual perception step-to-step differences, a neutral scale plus corresponding C-M-Y-R-G-B dye scales, and a set of 120 color patches (ten variations in lightness and saturation at 12 different hues) which cover the color space of the color material. The engineering of these elements, using colorimetric mapping to CIELAB L*a*b* aims for each element, and the conversion of these into dye density, color material aims, have been discussed.