Tino Schwarze schrieb am Montag, 23. Juni 2008: > On Mon, Jun 23, 2008 at 12:29:46AM +0200, Jan Schrewe wrote: > > > > > The file will go to an offset print shop[1]. They demand PDF/X3 > > > > > with ISOCoated v2 profile which is what I will provide. I fiddled > > > > > around with gs and cinepaint to check CMYK values and it doesn't > > > > > look good at all (there's no black any more in the files converted > > > > > using tifficc in final PDF/X3 output), but I suppose this is some > > > > > other glitch, maybe in gs (8.50) or in cinepaint... which tool > > > > > would allow me to check real CMYK values in PDF output? > > > > > > > > You don't need to convert your images from RGB to CMYK before you > > > > import them into scribus. Scribus dows take care of that. > > > > > > > > The same goes for colors. As Andreas already said: Define a black in > > > > RGB and let scribus take care of the conversion. You need to make > > > > sure that you use the same input profiles for your colors and your > > > > images, though. > > > > > > In theory, yes. But my tests show that RGB-0/0-0 black as a colored > > > rectangle is different from an RGB-0/0/0 black image. Even on screen it > > > looks very different! When I export to CMYK-PDF and look at it in > > > acroread8, it also looks _very_ different. It is not just some > > > almost-indistinguishable difference, you notice it instantly. And I'm > > > not going to try to print that. > > > > > > I only use two profiles: sRGB for all RGB, ISOcoated v2 for all CMYK. > > > I only get a coherent appearance if I use a huge black image as > > > background as opposed to a color (either CMYK or RGB, I couldn't find > > > something that matched). > > > > > > Something in Scribus' RGB image -> CMYK workflow is different from it's > > > RGB color -> CMYK workflow... > > > > Are you using the same profile for "Solid Colors" and "RGB Images" in the > > color management settings? Scribus can apply different profiles to them. > > Does the image have a profile embedded? Is the rendering intent the same > > as for the colors? > > I checked that, about a thousand times... I use "relative colorimetric" > everywhere. I've got sRGB for solid colors as well as images (and as > monitor pseudo-profile). There is no profile in the RGB image, Scribus > displays "sRGB IEC..." as Input profile when I look at the images tab. > > If I disable "black point compensation", an image with embedded > ISOCoated profile (produced via tifficc) get's darker on screen, > everything else seems to stay the same. RGB black color and RGB black > image still doesn't match - they are visibly different. > > Tino.
Okay, I tried your setup and I get non-matching blacks if I do try a CMYK black in Scribus. Then the image is real black und the CMYK black is something like 80% black. If I make a RGB black (Change "Color Model" in the "Edit Color" dialogue to RGB) the black from scribus and the black from the RGB image match, if I export a PDF/X3 and viewing it in Acrobat Reader. Did you ceck that you are using the right color model, when you craeted your color? Jan
