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: > > http://marshwiggle.net/scribus.png > > > cheers > > dc
Hi, 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 the moment. 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 lcms)) 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 world testing. Cheers, Peter
