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PDF, CMYK and cairo
by Aubanel MONNIER
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2008/2/22, Alexandre Prokoudine <alexandre.prokoudine@...>:
I'm not sure that I understand everything, but in terms of API i think the _rgba functions should be replaced by _color functions with
type color = | Rgba of int8 * int8 * int8 * int8 | Cmyka of int8 * int8 * int8 * int8* int8 | Spot of spot_color
Possibility to define a conversion function for back-ends whose do not know how to handle certain color types might prove useful I guess (defaults to returning an error "I do not know how to handle this color type"); Additional thought might be necessary for CMYK and TIFFs in CMYK, but I guess this could be handled transparently (just look at the data in the bitmap ?).
For me the only big question in terms of API is: should the colorspace be document specific or on a per color basis ? Is there any use case where you want to mix on the same document RGBs and CMYKs ? I don't think so, but I might be wrong.
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On Fri, Feb 22, 2008 at 6:38 PM, Aubanel MONNIER wrote:
> Hello all,
> I was looking at the cairo-pdf export code and wondered how hard it would be
> to output PDFs in CMYK(a) colorspace ? From what I've seen it shoudl be
> fairly easy on inkscape side. However the status of CMYK(a) support in Cairo
> looks unclear to me (found some references in cairo ML but nothing in the
> actual cairo headers, + a ruby (?) implementation for it). Does anyone have
> a some knowledge / pointers on that ?
Not implemented yet.
I spoke to Carl Worth and Behdad Esfahbod about it before (November
2007) and they basically told me that everyone asking about it has
his/her own understanding of what CMYK support means.
Specifically, Behdad told me that a good proposal coming from Inkscape
team might help designing API.
Alexandre
I'm not sure that I understand everything, but in terms of API i think the _rgba functions should be replaced by _color functions with
type color = | Rgba of int8 * int8 * int8 * int8 | Cmyka of int8 * int8 * int8 * int8* int8 | Spot of spot_color
Possibility to define a conversion function for back-ends whose do not know how to handle certain color types might prove useful I guess (defaults to returning an error "I do not know how to handle this color type"); Additional thought might be necessary for CMYK and TIFFs in CMYK, but I guess this could be handled transparently (just look at the data in the bitmap ?).
For me the only big question in terms of API is: should the colorspace be document specific or on a per color basis ? Is there any use case where you want to mix on the same document RGBs and CMYKs ? I don't think so, but I might be wrong.
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Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
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