Sadly, Apple actually does have good documentation for Core Image. It just never made it into their new system and is instead languishing in the "archive": ht

Sadly, Apple actually does have good documentation for Core Image. It just never made it into their new system and is instead languishing in the "archive": https://developer.apple.com/library/archive/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/filter/ci/CIColorCubeWithColorSpace https://developer.apple.com/library/archive/documentation/Gr... Apple deployed a new documentation system, and no one stopped to make sure all the "old" stuff got translated through.