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home :: oyranos :: icc_examin_2008.01.21.html
Mon, 21 Jan 2008
Gamut mapping
The below screenshot of ICC Examin working as CinePaint plug-in showes the
mapping of a CIE*Lab colour grid to ECI-RGBv2 or LStar-RGB:
The snapshot was created by assigning a Lab profile to Bruce Lindbloom's
RGB16Million.tif . For better handling I scaled the Lab16million.tif to a handy
size. Then the samples where viewed in CinePaint's ICC Examin plug-in. After
that I had let CinePaint convert the Lab values to Rgb and ICC Examin showed
the colour movement, appearent here as coloured lines. The small squares show
the final Rgb postions. The projection
is a 3D view into the CIE*Lab colour space from the CIE*b+ direction. The upper
samples point to CIE*L 100 the lower to CIE*L 0.
Interessting is the front plane (+CIE*b) with the mapping of green, yellow and
some oranges. They work in a almost lightness (CIE*L) preserving way. The left
side (+CIE*a) reds, magentas and blues show a strong lightness modification.
The snapshot helps me in improving my gamut creation algorithm in ICC Examin.
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