Blender Git Loki

Bring DCI colorspace configuration for DCP creation

Based on LUT and XYZ conversion matrix from OpenDCP.

Expose already-existing DCI view of Display transform (which was
hidden by color management changes for 2.80). Introduce an input
LUT which is what OpenDCP is doing and what makes the output of
Blender's DCI match OpenDCP result.

Additionally introduce DCI Filimc which will first perform filmic
conversion before the rest of DCI conversion. This allows to export
EXR images sequence directly from Blender as if it was first exported
to PNG/TIFF first.

This is a sub-optimal, but is something we use at the studio to deal
with DCP at this time.