Hi,
The matrix XYZ -
I'm trying to write a little application that produces ICC profiles
for the simulation of color blindness (deuteranopia and protanopia).
I think the correct way to deal with that would be to build an
abstract XYZ -> XYZ profile holding the simulation. In this
way you got no dependencies on any RGB space.
XYZ can be readily obtained by chaining XYZ to LMS
and LMS to XYZ matrices. You need not RGB anymore
because all that is handled by the input/output profiles.
A multiprofile transform may be used latter to obtain
the RGB -> RGB, by means of icclink, for example.
As additional benefit you are not restricted to RGB anymore.
For bulding such abstract profile, you need a something
like:
hProfile = cmsOpenProfileFromFile("abstract.icc", "w");
AToB0 = cmsAllocLUT();
cmsAlloc3DGrid(AToB0, GRID_POINTS, 3, 3);
cmsSample3DGrid(AToB0, Forward, NULL, 0);
cmsAddTag(hProfile, icSigAToB0Tag, AToB0);
cmsSetColorSpace(hProfile, icSigXYZData);
cmsSetPCS(hProfile, icSigXYZData);
cmsSetDeviceClass(hProfile, icSigAbstractClass);
cmsCloseProfile(hProfile);
cmsFreeLUT(AToB0);
Then, you need to write the callback:
static
int Forward(register WORD In[], register WORD Out[], register LPVOID Cargo)
{
cmsCIEXYZ XYZ;
cmsXYZEncoded2Float(&XYZ, In);
// ... apply here the transform XYZ = [M] * XYZ
cmsFloat2XYZEncoded(Out, &XYZ);
return TRUE;
}
Hope this helps
Regards,
--
Marti Maria
The littlecms project.
www.littlecms.com
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