[cairo] Spot colors (and CMYK)

Kai-Uwe Behrmann ku.b at gmx.de
Mon Dec 28 13:27:08 PST 2009

Am 28.12.09, 17:55 +0100 schrieb ecir hana:
> Just to check if I understand this correctly:
> - to support CMYK one has to be able to create CMYK solid source
> pattern, i.e. _cairo_color struct needs to have other components
> besides red, green, blue and alpha?
> - to support spot colors... variable number of attributes in
> _cairo_color? I'm lost, I don't know... Spot color is just a name
> ("Ultramarine") which has a fallback in the case the printing device
> does not have that particular colorant (because it still might be
> possible to print it in subtractive color space) and maybe even one
> more fallback if it is displayed on the screen (RGB)? Then, there is
> another issue because sometimes it is useful to define multiple spot
> colors (i.e. DeviceN) so one could create solid pattern out of
> "Ultramarine" and "Silver". (Btw, then CMYK becomes just a special
> case of color space with colorants "Cyan", "Magenta", ....)

The DeviceN path appears better for that: Cmyk+"Ultramarine"+"Silver".

kind regards
Kai-Uwe Behrmann
developing for colour management 
www.behrmann.name + www.oyranos.org

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