CIE
Division 8 - TC8-03: Survey of Gamut Mapping Papers
CARISMA (1992)
This report describes the gamut mapping work carried out by Johnson, Luo,
Rhodes and their co-workers as part of a project entitled Colour Appearance
Research for Interactive System Management and Application (CARISMA). Their
approach to investigating gamut mapping was to "get experienced [scanner]
operators to reproduce images and see what they do to them". To do this,
a Kodak Q60 Ektachrome transparency - on which the IT8.7/1 chart (ANSI,
1993) is based - was given to five colour reproduction companies in the
UK and the USA. Scanner operators were then asked to scan the transparency
both with their "standard" setup and also to edit the setup to give a better
reproduction if they felt it was necessary and a gamut mapping algorithm
(which will be described in detail in Section 5.42) was then developed
on the basis of the resulting reproductions.
The interesting characteristics of this algorithm are that it suggests
changes to hue and that it uses different mapping methods for different
hues depending on the relative shapes of the original and reproduction
gamuts. Apart from the main gamut mapping algorithm, the report also shows
that there was substantial agreement between the different scanner operators
(using different equipment and being in different countries).
Last updated: 17 August 1999 by Jan
Morovic