[Openicc] printer, driver, CUPS, PPD, printing GUI, ICC-profiles, colord, Oyranos, taxi....

[Chris Lilley]

On Wednesday, January 18, 2012, 5:07:27 PM, Michael wrote:

MS> On Jan 18, 2012, at 7:18 AM, Alexandre Prokoudine wrote:

>> You can assign a CMYK or a L*a*b* ICC profile, if you really want to.
>> Per-channel values will be saved in floats.

MS> Right, my point was that you needed to use a calibrated color
MS> space; I am not aware of any Device* color support in SVG.

SVG 2 has them:
http://dev.w3.org/SVG/modules/color/master/SVGColor.html#device

<fallback> device-gray(<gray>) |
<fallback> device-rgb(<red> <green> <blue>) |
<fallback> device-cmyk(<cyan> <magenta> <yellow> <black>) |
<fallback> device-nchannel(<number>+) | 

where fallback is an sRGB specification.

However, those are recipes, not colours. So you can't interpolate them (e.g. if you were to unwisely use them in a gradient); the spec says:

"As these are uncalibrated, any interpolation or compositing occurs using the fallback sRGB color value."

They are discouraged, and should only be used where really needed. Typical uses would be putting up colour swatches for quality control purposes.

-- 
 Chris Lilley   Technical Director, Interaction Domain                 
 W3C Graphics Activity Lead, Fonts Activity Lead
 Co-Chair, W3C Hypertext CG
 Member, CSS, WebFonts, SVG Working Groups