Camera manufacturers produce and provide their own IDTs as part of being an ACES Logo Program Product Partner (RED is a Product Partner). Most manufacturers choose to distribute the IDTs as part of their SDK and/or as downloads on their websites (the Academy will also host the CTL version as part of the aces-dev package if requested to do so by the camera company - the directory is called “
At least in the more distant past, the RED IDTs were only available within REDCINE-X PRO by checking the “Use ACES” option on export. I’m not sure if they’re now providing them as part of their SDK or not. Perhaps someone closer to implementation can weigh in on the current state of things.
If not specifically provided as part of the SDK, then it’s likely that Filmlight opted to implement a conversion from the published RED WideGamutRGB/Log3G10 values. This is not all that difficult or any different than converting from any other published color space encoding/non-linear encoding.
The steps would be:
- a linearization of the data from Log3G10 using the published formula and
- a color space conversion matrix from RED WideGamutRGB->XYZ and XYZ->ACES (this step could be condensed into a single matrix)
In lieu of an official IDT provided from RED, Blackmagic could do the same thing or someone could write it into a DCTL for you.