On Wed, Nov 21, 2018 at 3:02 PM Jan U. Hasecke <juh+ntg-cont...@mailbox.org> wrote:
> Am 19.11.18 um 11:14 schrieb luigi scarso: > > > Perhaps this is still useful > > https://www.tug.org/TUGboat/tb31-3/tb99scarso.pdf > > Thanks a lot for the hint. > > I don't understand the equations but at least I found transicc to > calculate color conversions. > > What precision is useful in the wild? > > I now use three digits after the decimal point, eg.: > > \definecolor [hs-logoblau] [c=0.976, m=0.665, y=0.028, k=0.116] > > It's safe to specify a color as 8bit per channel rgb, or in percent. i.e. see for example https://en.wikipedia.org/wiki/List_of_colors:_A%E2%80%93F (more on https://en.wikipedia.org/wiki/Lists_of_colors ) 16bit per channel rgb are also possible, but old RIP can have problems (for example https://www.pantone.com/color-finder/#/pick?pantoneBook=pantoneSolidCoatedV3M2 shows rgb 8bit per channel and CMYK 0 to 100) Btw: be careful of the checker shadow illusion https://en.wikipedia.org/wiki/Optical_illusion colors not always look as they are expressed in numeric form. -- luigi
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