[Scribus] Colour management questions
Thu Dec 2 13:16:32 CET 2004
On Thursday 02 December 2004 13:36, David Purton wrote:
> Here is a links to an image, that will better explain what I meant in my
> original email:
That looks *exactly* like I would expect.
One very important point, GIMP while it can generate CMYK separated TIFF's,
cannot yet display accurately for the gamut compression in the conversion
from > RGB > CMYK Euroscale. The current Color Management while it uses
littlecms, does not yet have all the pieces. So opening a CMYK TIFF in GIMP
is not really showing what really is going to print to CMYK.
What the current GIMP setup does is do a conversion to sRGB and dump that to
screen without an correction for the monitor. *That* is the missing piece at
Two other issues affecting your perception of what is "correct":
Your monitor profile is not accurate for your system. (Very likely - without
a good accurate monitor profile, all bets are off.)
Littlecms is overcompensating for the gamut compression (Possible, but the
delta E (error of the conversion) has been measured to be very accurate in
In my experience, lcms + scribus with carefully made monitor profiles created
by Monaco and Gretag tools under Windows, *very* accurately predict the gamut
compression when printing to a real CMYK printer.
A good example was the previous Scribus logo, when printed to a carefully
profiled printer (EFI RIP printing to 1200 DPI CMYK laser), the screen to
print match was within 5% of what I saw in Photoshop 6 with the same
hardware/printer combo, using the same PDF output.
Luckily, I have a client who has let me play with these nice toys for real
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