Re: [Lcms-user] Building a profile with a Rec 709 transfer curve
An ICC-based CMM for color management
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From: Florian H. <lis...@ho...> - 2013-01-08 16:07:52
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Am 08.01.2013 10:05, schrieb Richard Hughes: > On 7 January 2013 17:57, Marti Maria <mar...@li...> 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". Agreed, the curves from the attached profile look very steep. The curves from the profile attached to your earlier message look alright to me (and closer inspection confirms that they indeed follow the Rec. 709 transfer function). -- Florian |