[cairo] Spot colors (and CMYK)

James Cloos cloos at jhcloos.com
Fri Feb 19 16:31:35 PST 2010

>>>>> "Francois" == Francois Robert <frobert at atex.com> writes:

Francois> Just a side note: In PDF, the blending space is _explicitely
Francois> specified_ (see section 7 on transparency), and it can be any
Francois> flavor or gray, RGB or CMYK (but not L*a*b*). Not sure if it
Francois> is something that Cairo must care about ?

Probably just to the extent that cairo documents why spaces like L*a*b*,
L*u*v*, HSV, Yuv, and similar do not make good spaces for blending:

,----< quoted from PDF Reference 1.7, §7.2, p519 >
| the compositing computations in spaces [which represent lightness and
| chromacity separately] do not give meaningful results when applied
| separately to each component

James Cloos <cloos at jhcloos.com>         OpenPGP: 1024D/ED7DAEA6

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