Re: [Lcms-user] Building a profile with a Rec 709 transfer curve

[Marti Maria]

Hi Richard, I think you have e and f swapped, this is from the documentation (Table 52) Y = (aX + b)^Gamma + e | X >= d Y = cX + f             | X < d And this is Rec709 Obviously this is not the case. What really happens is parametric curve type 5 has aX raised to gamma, whilst in Rec709  only L is raised to the 0.45 exponent. Sorry about the confusion Regards & merry xmas Marti

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