[Scribus] cmyk vs rgb

Farid Elyahyaoui frietfriet
Tue Apr 24 13:59:55 CEST 2007


thanks for all the answers. I tried to read the link from
Hal V. Engel (http://www.normankoren.com/color_management.html)
but it's way over my head so I played around a little bit to learn.
I'm really not interested in 100% color match but my new printing
company requires CMYK pdfs. The previous one accepted RGB pdfs and the
colors of the print result were very much OK with me. Sending him a
CMYK pdf without color management gave crappy colors in the pictures
while sending a RGB pdf (with no color management at all) gave good

Now I switched on color management:
RGB pictures: sRGB IEC61966-2.1
CMYK pictures: ISO Coated
Solid colors:  sRGB IEC61966-2.1
Monitor: sRGB IEC61966-2.1 (don't have a monitor profile)
Printer: ISO Coated

Rendering intents:
Monitor: Relative Colorimetric
Printer: Perceptual
Simulate Printer (checked)
Use blackpoint compensation (checked)

PDF output settings:
Color tab
Solid colors:
   use ICC Profile (checked)
   Profile: sRGB IEC61966-2.1
   intent: Relative Colorimetric
  Don't use embedded ICC profiles (checked)
  Profile: sRGB IEC61966-2.1
  Rendering intent: Relative Colorimetric

PDF X/3 tab:
 Output profile: ISO Coated

The solid colors in scribus with the 'simulate printer on screen' on
for some reason still look greyish.
If I now open the pdf in acroread It looks OK (no dark/grayish colors anymore).
Am I now on to something? Would this be OK to send to the printer now?

Old post:
> I'm still trying to grasp the color management settings in scribus
> (and color management in general). I understand that RGB and CMYK are
> completely different color spaces. What I fail to understand is the
> following though:
> If I load a RGB jpeg into scribus and output a cmyk pdf and view the
> pdf on the same machine with acrobat reader the colors look greyish. I
> understand that I need color management to get matching colors between
> screen and what gets printed on paper.
> BUT (!) why do I get the different colors if I only work on one
> monitor on one machine?
> One would expect that if scribus calculates RGB->CMYK and acrobat
> displays these CMYK colors on the monitor (using RGB of course) that
> the colors would be the same. that is if the calculations are the
> inverse of each other. Or am I completely wrong here?

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