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color conversion from CYBK?? to RGB. Help!

Oct 8, 2012, 01:18
Post: #1
color conversion from CYBK?? to RGB. Help!
I bought a Pepin press book & cd, of wallpaper patterns. They are not in the rgb mode, but the (what is it? ) CYBK? mode. When I load them onto gimp the colors are way off. Apparently gimp converts them to rgb mode, but the colors are glaring & clashing. Is there a way to fix this?
Thanks!
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Oct 8, 2012, 06:58
Post: #2
RE: color conversion from CYBK?? to RGB. Help!
What format are these? JPG? TIFF? do you get any message about a color profile?

Now answering your questions on
https://Gimp-Forum.net
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Oct 8, 2012, 09:18 (This post was last modified: Oct 8, 2012 09:19 by rich2005.)
Post: #3
RE: color conversion from CYBK?? to RGB. Help!
There is a colour shift CMYK -> RGB -> CMYK, not a lot you can do about it. It helps to know a little about colour profiles.

This is a little test generated in Inkscape, the same image but the top is exported as cmyk and the bottom as rgb. http://i.imgur.com/FaQ1L.jpg you should see a shift in the blue and green colours.
In Gimp it can get more complicated if you bring color management into play, you can get something different.
http://i.imgur.com/LX9Ql.jpg
and if you can ever get your monitor profile to be accepted, different again.

If it is only for viewing, it might be worth trying something like XNviewMP
http://newsgroup.xnview.com/viewtopic.ph...318b6805ac
This is in browsing mode, you can get full screen: http://i.imgur.com/ntmW1.jpg

For editing, you are stuck. AFAIK Gimp and the other free editors only use RGB although there are plugins/ways to convert to CMYK.

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Oct 8, 2012, 15:00
Post: #4
RE: color conversion from CYBK?? to RGB. Help!
Thanks much Rich2005 - looks like I'm out of luck with this cd - but then what is the cmyk mode designed for? What's it good for? Etc.
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Oct 8, 2012, 15:29 (This post was last modified: Oct 8, 2012 15:37 by rich2005.)
Post: #5
RE: color conversion from CYBK?? to RGB. Help!
(Oct 8, 2012 15:00)pixelated Wrote:  Thanks much Rich2005 - looks like I'm out of luck with this cd - but then what is the cmyk mode designed for? What's it good for? Etc.

CMYK is used by commercial printers, The Cyan, Magenta & Yellow colors are printed as overlaying layers then with Black (K) as an extra because C+M+Y gives a muddy black. The icc profiles can relate to a device such as monitor (icm) and there are others SWOP/FOGRA which are printing standards to ensure consistancy.

One thing you should look at if you are comparing images in your book and images displayed in Gimp is your monitor setup, even without using profiles most people have their monitor set far too bright & too contrasty.

edit: I was trying to remember a good link for monitors, could not remember the full name but this is it
http://www.cambridgeincolour.com/tutoria...ration.htm

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Oct 9, 2012, 13:53
Post: #6
RE: color conversion from CYBK?? to RGB. Help!
This is quality information - some of it still somewhat over my head, but the beginning of a new vocabulary. Monitor calibration is surely critical to good graphics creation. (It seems a bit daunting: I approach it timorously but gratefully.) I much appreciate your knowledge and help.
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