CIE
Division 8 - TC8-03: Survey of Gamut Mapping Papers
Hoshino (1991)
A method for gamut compression and expansion is described here which is
intended for the mapping between images defined in terms of CMYK values
and the colour gamut of high definition television (HDTV) on which they
are to be displayed. Lightness mapping is carried out using a non-linear
tone reproduction curve, which, however, is not described in more detail.
After this, the chroma of original colours in general is either compressed
or expanded along lines of constant lightness and hue angle, depending
on the gamut boundaries of the two media along a given line. In the case
of gamut expansion, a hue shift was also employed for some colour regions
(i.e. cyan and blue) so as to make the degree of expansion more similar
between neighbouring areas.
Last updated: 17 August 1999 by Jan
Morovic