One-Dimensional, Two-Dimensional, and Spot-Color Management and Control Methods - Control of Color Imaging Systems: Analysis and Design - page 464

FIGURE 8.27 (a) CYK ! L*a*b* and MYK ! L*a*b* gamuts, (b) CMK ! L*a*b* and
CMY ! L*a*b* gamuts, (c) CYK ! L*a*b* and MYK ! L*a*b* gamuts (alternate view
shown with neutral zone), and (d) CMK ! L*a*b* and CMY ! L*a*b* gamuts (alternate
view shown with neutral zone).

(CMY ! L*a*b*, MYK ! L*a*b*, CYK ! L*a*b*, and CMK ! L*a*b*) and a
neutral zone.
Figure 8.27a through d shows in L*a*b* space for the four gamut classes,
CMY ! L*a*b*, MYK ! L*a*b*, CYK ! L*a*b*, and CMK ! L*a*b*,
respectively. The overall gamut is the union of all of them. In plots c and d,
Figure 8.27 shows an additional region classi ed as the neutral zone. This approach

reduces the dimensionality of the four color process to three color groups. As a result
of this reduction, a three-input three-output MIMO control algorithm can be imple-
mented to achieve improved spot-color accuracy.
These gamut classes represent the color reproduction capability of a printer
obtained by considering three separations at a time. This can be a forward
printer model obtained via experimentation on a color printer or a mathematical