On 7 January 2013 17:57, Marti Maria <marti.ma...@littlecms.com> wrote: > But anyway, I think there is a clean way to do what you wish, and this needs > only a few math. > It seems to me the issue comes because parametric 5 is in the form > (a*x)^g > See below the parameters disposition
Unless I'm mistaken (and that's entirely plausible) we want the TRC to be the inverse of the Rec. 709 curve, rather than the power curve of that type. I've attached the ICC profile generated from your type 5 parametric curve which to me seems the "wrong way around". Using the inverse method gives me a profile that matches the rawtherapee Rec. 709 profile exactly. I don't know if it's possible to do an inverse Rec. 709 profile with an existing parametric curve type. If it is, the profile size would be substantially smaller so still might be worth looking into. Richard.
Rec709.icc
Description: Binary data
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