ACES 2.0 CAM DRT Development

Yes, the mistake @priikone picked up only affected hellwig_lib_v057.h. The other v57 DCTL files are unchanged.

Thanks for that. I don’t have an OpenCL system here to test. When I had one before I always found it was far more picky about DCTL syntax than the others.

I’ve pushed an update with your suggested fix.

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I pushed CAM DRT v058 with some new parameter values to my repo. I’ll create a pull request for Alex later after we’ve discussed some things in the meeting.

One thing we’ve talked privately was P3D65 inverse. Previous versions haven’t inverted P3 as well as Rec.709 and to get it inverse better we’d have to increase cusp smoothing, rather than what I’ve been doing lately, which is to reduce it to reduce clipping. This version should bring P3 inverse to same level as Rec.709, but it does come with a bit more clipping in the forward direction in Rec.709.

Param changes (no code changes):

  • Change power of powerP compression from 1.2 to 1.0
  • Change Lower hull gamma constant from 1.14 to 1.145
  • Change Smooth cusps value from 0.18 to 0.12
  • Change Smooth J value from 0.02 to 0.0 (becomes possible to eliminate)
  • Change Smooth M value from 0.18 to 0.25
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