Created attachment 125362 [details] [review] in this patch we simply use "no light" for full black ink Hello, If in pdf document black color is set to full black ink as CMYK(0,0,0,1), it is displayed on monitor as RGB(35,31,32), which makes the text greyish and thus somewhat harder to read. I checked the color by making screenshot of pdf document and using color picker tool in GIMP. You can check this yourself by compiling the following example by pdftex: \pdfliteral{0 0 0 1 k} \vrule width 1cm height 1cm \bye In contrast, CMYK(0,0,0,0) produces pure white color RGB(255,255,255), as it should be. This means that we use "full light" for no ink. Then why we do not use "no light" for full black ink? Please consider applying the attached patch or explain why it should not be applied. Regards, Igor
The reason CMYK(0,0,0,1) does not map to RGB(0,0,0) is CMYK(0,0,0,1) is not the darkest CMYK color. CMYK(1,1,1,1) is the darkest (see https://en.wikipedia.org/wiki/Rich_black). Testing with CMYK(0,0,0,1): Adobe Reader: RGB(35,31,32) Ghostscript: RGB(34,31,32) Poppler: RGB(35,31,32) Testing with CMYK(1,1,1,1): Adobe Reader: RGB(0,0,0) Ghostscript: RGB(0,0,0) Poppler: RGB(0,0,0) Poppler is outputting exactly the same colors as Adobe Reader.
No. Default black will start only black ink. No CMY inks. It is normally used for printing text.
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