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HELP Color error using cmyk

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HELP Color error using cmyk walshlg 02 Jul 02:57
  HELP Color error using cmyk rich404 02 Jul 12:01
   HELP Color error using cmyk rich404 02 Jul 12:38
walshlg
2019-07-02 02:57:08 UTC (over 5 years ago)
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1

HELP Color error using cmyk

Ive had this issue in 2.10.0-2.10.10 and I really need help: The cmyk color I apply is not what is detected when I recheck with color picker.

I MUST use cmyk as i'm modeling for an inkjet colored 3d printer. (inkjets use c,m,y,k colored inks) I'm trying to make a skin color that works (printer color is also all off) so I Input 34,37,56,00 into cmyk, fill the selection with it then use color picker and what I get is WAY off -> 0,4,33,34. I cant handle ANY black so this totally screws up the printed color. Any ideas how to make gimp use the color I select and not change it??

TIA

rich404
2019-07-02 12:01:22 UTC (over 5 years ago)

HELP Color error using cmyk

Ive had this issue in 2.10.0-2.10.10 and I really need help: The cmyk color I apply is not what is detected when I recheck with color picker.

I MUST use cmyk as i'm modeling for an inkjet colored 3d printer. (inkjets use c,m,y,k colored inks) I'm trying to make a skin color that works (printer color is also all off) so I Input 34,37,56,00 into cmyk, fill the selection with it then use color picker and what I get is WAY off -> 0,4,33,34. I cant handle ANY black so this totally screws up the printed color. Any ideas how to make gimp use the color I select and not change it??

TIA

I can see the problem.

No solution that I can see. Post a bug report at

https://gitlab.gnome.org/GNOME/gimp/issues/

rich404
2019-07-02 12:38:49 UTC (over 5 years ago)

HELP Color error using cmyk

I can see the problem.

No solution that I can see. Post a bug report at

https://gitlab.gnome.org/GNOME/gimp/issues/

Not only Gimp

A little bit digging and the change in values also happens with online convertors. I tried a couple, both the same.

CMY(k) 34 37 56 00

converts to RGB 168 161 112

converts back to CMYK 0 5 33 34

The only suggestion is use Krita and start off in CMYK colorspace. The color picker there keeps the original values.