Appeal No. 1998-2679
Application No. 08/148,765
typically performed in the input device space or the output
device space. The problem is that the series depicted by 74
and 75 or Figure 7B of the specification represent images that
have very undesirable characteristics, such as objectionable
changes in the reproduced hues of image objects as they move
from shadow light to highlight. The present invention solves
the problem noted above by converting the image to an
"intermediary" color space in performing the nonlinear
"transform" in that intermediary color space or metric. The
intermediary color space is not just any intermediary
color space but one which defines "color primaries" and one in
which the "colorimetric properties" are "intermediary" to, or
"different" from, or unassociated with, those of the input and
output devices. The invention is further illustrated by the
following claim.
1. A method for transforming color-image signals
corresponding to a first set of color primaries to color-image
signals corresponding to a second set of color primaries,
comprising the steps of:
a. inputting a color image represented by color-image
signals, using an input device, the color-image signals having
first colorimetric properties including a chromaticity gamut;
b. transforming all the color-image signals
corresponding to the first set of color primaries to form
intermediary color-image signals corresponding to a third set
4
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