Hi all, i got the following problem with Scribus (1.3.3.3): When I print with "Apply ICC Profiles" enabled or export PDF with "Use ICC Profile" disabled for images, the color management seems to malfunction.
Background: I want to do color-corrected printouts on an inkjet printer and generate PDF's which are color-corrected for that printer (or a specific press) and will print accordingly. Sadly, not all printers really support PDF-X/3 ... To find out a bit more about the problem, I used a test document showing the same image encoded in four different color spaces: sRGB (narrow gamut RGB) and BestRGB (very wide gamut RGB), ISO-coated (CMYK) and a custom Inkjet profile (CMYK). All images were generated from the original sRGB one by relative colorimetric transformation. All rendering intents in Scribus were set to relative, too. Inside Scribus (color management enabled, calibrated and profiled display) the four images on the page look exactly the same. With the print preview option enabled, there are tiny differences. All as expected. I tested several exports, each with two different printer profiles (the same as in the CMYK images). Here are the results (first the ones that seemed ok): PDF-1.3 for Screen/Web: The four images look identical in acroread, PDF contains all four images converted to common RGB space (CalRGB?), PDF contains no color profiles. Color managed transform seems to be done here in Scribus. Output doesn't depend on printer profile set in Scribus. PDF-1.3 for Print with "Use ICC Profile" ENabled for images or PDF-X/3: The four images look identical in acroread (not in XPDF, seems not to support profiles) PDF apparently contains the original image data and profiles. Output doesn't depend on printer profile set in Scribus. When printed from Adobe Reader, the resulting PS looks ok in Ghostview, ICC profiles seem to be correctly converted to CSA and CRD profiles which Ghostscript then uses for color-correction. Printing (PS output), "Apply ICC Profiles" DISabled (printing to file, display with gs): The four images look different, but quite ok. Apparently, the RGB images are converted to CMYK by a generic transform, no color management is done at all (why?). Images look a bit different because they're encoded in different color spaces. Output doesn't depend on printer profile set in Scribus (why?). So far, so good. Sorry for the long description of things that did work. :-) I wanted to ensure that my color management worked. Now for the things that didn't ... PDF-1.3 for Print with "Use ICC Profile" DISabled for images: The four images look completely different, colors of the RGB-source images are _way_ off (e.g. yellow goes green, ...). Results look quite different for different printer profile settings, but horrible with both. The CMYK-source images however look the same as in the "Printing (PS output), "Apply ICC Profiles" DISabled" case, independent of the printer profile. PDF output contains all images in CMYK, no embedded profiles. Obviously, Scribus does some color conversion with the RGB-source images, and somehow uses the printer profile. But the source-profiles don't seem to be used, cause the results look different for the sRGB and the BestRGB image. And why the horrible result? Printing (PS output), "Apply ICC Profiles" ENabled: Results are identical to PDF-1.3 for Print with "Use ICC Profile" DISabled. PS output contains all images in CMYK, no embedded profiles. I really don't understand what's going on here - anybody got an idea? My setup: scribus-1.3.3.3, lcms-1.15, linux. Another minor point: What should the "Apply ICC Profiles" setting in the print dialog.really do? The tooltip says, it embeds the ICC profiles in the print stream when color management is enabled. But the resulting PS doesn't contain any profiles, neither CIEbased nor ICCbased. Instead, Scribus does color convertion (with the strange results described above). However, when the option is disabled, everything get's converted to CMYK without color management, even though color management is enabled in Scribus. Is this intended? I'd be glad for any help, Oliver P.S.: Thank you, Scribus team, for creating the software that I had sorely missed for a long time!
