Appeal No. 1998-0668
Application 08/036,650
where a* and b* are values of the CIELab color coordinate
system and FT is a depth of shade value which defines points
of equal color strength. Figure 1 shows a depth of shade
plane of the FTa*b* color space with a segmentation into
triangular levels by the calibration data of different dyes,
in which points P1 to P8 are corner points and define dye
data. Points on a line between two points, e.g., between P1
and P7, represent a mixture of the dyes corresponding to P1
and P7, and points within the triangular segment represent a
mixture of three dyes defined by the corner points, e.g.,
the colors at the u or + points in figure 3 are defined by
mixtures of P1, P6, and P7. The sum of percentages of dye
must be 100 (see Tables 1-3 for percentages of points of the
segment in figure 3). The amount of dye for different
depths of shade FT are known (col. 8). The coordinates in
the FTa*b* color space are determined from the reference
color on a substrate (col. 6, lines 21-25) and from the
coordinates a*, b*, and FT the relative amounts in g of dye
per kg of print paste can be computed (col. 8, lines 55-63).
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