Hi!
I'm trying to create a gray profile that has an L* (L-star) response curve, but
I'm a little confused about the "parametric tone curve" syntax.
Is there an example how to create the correct tone curve? I guess I need the
inverted version of L* companding, right? Would that be a 4 parametric curve,
with:
y(Gamma) = 3.0
a=1.0/1.16
b=0.16/1.16
c=100.0/903.3
d=0.008856*903.3/100.0
So in code something like that:
cmsFloat64Number lStarParams[5] = { 3.0, 1.0/1.16, 0.16/1.16, 100.0/903.3,
0.008856*903.3/100.0 };
cmsBuildParametricToneCurve( ctx, 4, lStarParams );
???
Or is it as easy as passing a NULL for the TransferFunction parameter in
cmsCreateGrayProfileTHR() because the response matches the PCS response?
Thanks,
Marco
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