Hi, slightly off-topic, since not about Scribus, but I posted because this list has a lot of knowledge about printing techniques (and I'm currently not involved in GIMP-lists).
I want to simulate the effect of multi-color offset printing. I have available a set of layers in the GIMP, each layer in one of the CMYK-colors. However, the GIMP doesn't have a layer mode that would show me how the image would look like when all these layers are printed on top of each other What I tried out was to invert each of the layers, then use the 'Addition' layer mode on each layer, and invert the result back again. Theoretically, this should be what I'm looking for, since each CMY-color is the invert of one of the RGB-colors (isn't it?). In practice, it looks like the right result... I know the GIMP can decompose and compose CMYK-images, but I also want to simulate printing with other spot colors, which should work just the same. To bring this topic in relation to Scribus, I'm considering creating a duotone print job with specific inks. A special processing of bitmaps can restore much of the original color information, but diversifying the image printed in both inks. Actually, my question is related to some experiments I'm conducting in that area, of which some information can be read here: http://users.pandora.be/vicmortelmans/fts/duotone Feedback welcome! Please don't confront me with the fact that I overlooked some GIMP-feature that does all this out of the box :) Groeten, Vic
