CIE
Division 8 - TC8-03: Survey of Gamut Mapping Papers
Spence, Granger & Rinehart (1994)
This patent of the Eastman Kodak Co. describes a technique which
uses an iterative process for determining a set of transformations between
two colour reproduction systems, whereby the device-independent colour
space is that of the ATD colour appearance model (Guth, 1989). As focus
of the work seems to be the matching of two printers, the problem of gamut
mapping is not fully addressed. The solution which is suggested is to map
the out-of-gamut colours onto the closest colour on the gamut boundary.
The technique claims to obtain a good colour reproduction by achieving
the following objectives, which in effect are the matching of six colours:
-
match lightness of three-colour (CMY) black solid overprint
-
match hue angle of CY (green) & MY (red) solid overprints
-
match colour of 50 per cent grey CMY tint overprint
-
match solid and 50 per cent black (K)
The problem being addressed here is one of mapping between two very similar
gamuts using only densitometry - i.e. it is directed at setting up a match
between different individual presses and proofing systems in a printing
environment. It might be a good solution for this particular task, but
it is unlikely that this method will work when other media are involved.
Last updated: 17 August 1999 by Jan
Morovic