One-Dimensional, Two-Dimensional, and Spot-Color Management and Control Methods - Control of Color Imaging Systems: Analysis and Design - page 443

C in

Secondary axis

C = M = Y
Gray axis

C = M, Y = 0

255

Secondary to
black Cyan

primary
axis

M = Y = 255
0 ≤ C ≤ 255

M = Y = 0
0 ≤ C ≤ 255

M in + Y in

0 255 510

Primary to black
C = Y , M = 255

FIGURE 8.9 Two-dimensional cyan TRC with different control axes.

2-D LUT

C

C

M+Y

+

M

P

M L*a*b out

C+Y

+

Y

Y

C+M

+

FIGURE 8.10 Two-dimensional calibration.

Example 8.3

Assume that a 13 13 CMY to L*a*b* characterization LUT is measured for a

digital color printer. The 2-D LUTs for C, M, and Y were

13

filled in by controlling
different axis shown in Figure 8.9. Fifteen grid points are chosen on each control
axis. The scatter plot of these grid points for the 2-D cyan TRC in (C, MþY) plane
is shown in Figure 8.11.
The corresponding 2-D LUT for the cyan TRC corresponding to the control grid
points of Figure 8.11 is shown in Table 8.6. This is obtained using the ICI algorithm.