ACES 2.0 CAM DRT Development

[nick (Nick Shaw)]

@Troy_James_Sobotka

…one is a very complex model and the other is literally doing nothing colourimetric to the FPGA quantal energy catch counts, and rolling through a sigmoid from a log encoding.

That is a reasonable solution for SDR only when you don’t have the requirements we have for the ACES 2.0 transforms. It’s essentially what the K1S1 transform does. But it does not tick any of these boxes, which we need to tick:

• Create a “family” of transforms for different HDR and SDR display targets which viewers will perceive as being “the same”, while also making use of the extended capabilities of more capable displays;
• Be able to produce any value within the display gamut, at least for Rec.709 and P3 SDR;
• Be invertible such that applying the transform in the reverse direction prior to the final forward direction is able to reproduce the result of any other rendering (for a given display).

@Troy_James_Sobotka

@nick

I was certainly able to obtain a similar result with an LMT consisting only of a matrix.

Do you have a demonstration?

It’s the image directly below my statement.