OpenGL extension EXT.cmyka
This module customises the behaviour of the OpenGL.raw.GL.EXT.cmyka to provide a more Python-friendly API
Overview (from the spec)
This extension provides a simple method for OpenGL to read and store images whose pixels have CMYK or CMYKA formats. The algorithms used to convert to RGBA from CMYKA and to convert back from RGBA to CMYKA are of the "black-box" nature, meaning that the application has little control over how the conversion is done. Also, this black-box mechanism is available only for transfers to or from memory, not for internal copies of pixel data (such as invoked by CopyPixels, CopyTexImage1D, etc.) However, the defined mechanism nicely handles 5-component CMYKA images, and it is very easy to use.
A more configurable and potentially higher quality color conversion can be implemented using the color tables, the color matrix, and possibly 3D and 4D texture lookup. Such a color conversion also applies to copied pixel data.
The official definition of this extension is available here:
Return boolean indicating whether this extension is available