El jue, 26-03-2009 a las 21:43 +0100, yahvuu escribió: > Hi all, > just to be shure (i'm probably just paraphrasing Andrew A. Gill's follow-up): > I think this task can be done equally well in an RGB space, say sRGB. > If Pantone's Bridge has sRGB approximations, it should be trivial. If not, > you have to convert that single color from your best-guess CMYK to sRGB first. It won't be useful if the image has to be imported in a program that actually lets you assign CMYK values. Following with my example, the bitmap could be imported into scribus and put together with a logo, with the right CMYK values. Chances are that, though quite similar, the colors won't be the same. > Thanks to GEGL's dynamic nature, the sRGB->CMYK separation will be "live", so > the resulting CMYK can be cross-checked immediately, like read-after-write with > good old audio tapes. But it will still be difficult to specify a color. For instance: I need the background of the image to be C=60%, K=100%. I'd use that combination because I want a rich black with cold shades of gray. If I use RGB, the separation will include Magenta and Yellow depending on the output profile and I wouldn't want that. > Please do so. The general need for CMYK support beyond mere color separation > has been put out quite clearly. Yet AFAIKS none of the examples has shown a > requirement for doing actual image processing in CMYK space (which is > a good thing, btw). By this i mean anything which can't be done by processing > the "plates" as separate grayscale channels (see Øyvind Kolas's post). It's fine to adjust the grayscale channels if we get a corrected preview interactively. In fact, that's the way you do some adjustments in Photoshop. But there are several tools (channel mixer, curves) that is useful to have working in CMYK space. --- Also, in this discussion it seems that it was never considered that you can be working on images that somebody else sent you and you don't control how they were created. If somebody sent you a separated tiff of a magazine ad and you have to do some editing on it, you'll be destroying the original separation converting it to RGB. And that's unacceptable. _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer
