[cairo] RFC the idea of n-plane color support

[Keith Packard]

Around 17 o'clock on Oct 29, Ross McFarland wrote:

> basically if you don't support an arbitrary number of color planes cairo
> couldn't be used as a RIP engine for a printer or printing press.

Just paint each channel in a separate buffer; if you aren't using a CIEXYZ 
traceable color space, there's no way cairo can understand what color 
you're using in any case.

-keith


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