CDL Color Transform Effect

[reinecke]

There is a continuum of color management that can potentially be included in OTIO (see #1805). Based on discussions in that thread and #1793 we feel like we know enough to implement a CDL effect schema.

The Schema should be:

{
  "OTIO_SCHEMA": "CDLEffect.1",
  "metadata": {},
  "offset": [
    0.0,
    0.0,
    0.01
  ],
  "power": [
    0.5,
    0.5,
    0.51
  ],
  "slope": [
    1.0,
    1.0,
    1.0
  ],
  "saturation": 0.0,
  "process_space": "ACEScct"
}

This would be a subclass of the otio Effect schema.

By practice - process_space should be a name from the OCIO studio config.

[BrandonBussinger]

while this has value on its own, I would just note that CDL is typically one operation in a larger stack that may be defined piecemeal, or as part of larger description like an OCIO config (likely in a VFX context) or an ACESclip (camera originated pipeline) and may stack differently in different parts of the pipeline (other effects may be added at different points in the stack). Worth keeping this scope in mind since it may mean having links to other effects to reference a common source (the OCIO etc...).

Also curious how one might declare if a media reference represents the clip or composition with the effect applied or not. In theory one could apply color to a clip, nest that then place a media reference on the nested object but that may not be a super intuitive way to handle it (and this remains a problem in ALE based workflows etc... with things like resolution and other media specific considerations like what ODT was used)