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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Every black has his uses: We can use 0%,0%,0%,100% for small text (because we don't want a blurring effect if more than 1 ink is used), and a rich black of 60%,40%,40%,100% for the backgrounds. For example a gradient from 5%,100%,100%,0% to 5%,100%,100%,100%, looks better than a gradient to 0%,0%,0%,100% or 50%,50%,50%,80%, ...or other black because only a ink is modified. And not only works for the black ink, it works for all inks.
In short, CMYK colors shouldn't be converted to RGB ones, only for screen preview.