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October 2006
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2006.10.17 12:24 "Re: Tag 346", by Toby Thain
> > >> But since there are apparently *zero* raster file formats that can >> contain indexed CMYK images, > > Photoshop supports indexed CMYK, IIRC. I'd be surprised. > > >> it's impractical to do any image manipulation on these bitmaps. > > Not at all...You just need an imaging library that supports > indexed CMYK and can read a "blob"...GraphicMagick, for example, > springs to mind. You could also use Adobe's new open-source GIL. > Or you could write your own. > > >> I am considering writing a custom tool that converts them to RGB >> palette on the fly, and back again. > > 4->3->4 color conversion is a BAD IDEA!! As the numbers > demonstrate, you will LOSE information (even with ICC-based color > conversion). Doesn't matter for the OP's purpose (as he explained). --Toby > > > Leonard > -- > ---------------------------------------------------------------------- > ----- > Leonard Rosenthol > <mailto:leonardr@pdfsages.com> > Chief Technical Officer <http://www.pdfsages.com> > PDF Sages, Inc. 215-938-7080 (voice) > 215-689-3863 (fax) > _______________________________________________ > Tiff mailing list: Tiff@lists.maptools.org > http://lists.maptools.org/mailman/listinfo/tiff > http://www.remotesensing.org/libtiff/