Pavel A. da Mek wrote:
Maybe theoretically, but not in practice. In the prepress world is common to use the four values of CMYK, for example in 'rich black' (http://marvin.mrtoads.com/richblack_vs_plainblack.html) or in PANTONE to CMYK transformations.
Thanks for the link, it is interesting. But is all this fuss with different black colors really necessary? I would suppose that the designer should not be bothered with such matters and that the printing device should solve the corrections resulting from the fact that 100% of ink does not filter 100% of the light but, say, only 80%, and so the ideal CMYK 0,0,0,90% must be replaced by 50%,50%,50%,80%, which means 62.5%,62.5%,62.5%,100% of the maximal amount of the ink. After all, the color space perceived by humans is 3-dimensional and so there is no need to use four coordinates.
P.A.
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Here is an example I have done in photoshop (because it has color management) to show why CMYK colors shouldn't be modified: Imagine we want to print this image: http://img398.imageshack.us/img398/8898/degradadosok1ak.png In inkscape the colors are modified: 5,100,100,0 -> 0,100,100,5 5,100,100,100 -> 0,0,0,100 50,50,50,80 -> 0,0,0,90 0,0,0,100 -> 0,0,0,100 60,40,40,100 -> 0,0,0,100 50,25,50,25 -> 33,0,33,44 And the printed work is: http://img399.imageshack.us/img399/1849/degradadosmal8ma.png
Thats why inkscape or the printing device do not have to do the corrections, because the designer wants the exact output (first image).