On Wed, 7 Jun 2006, Marti wrote: >> I am trying to convert RGB images to CMYK using lcms >> and libjpeg ( with the help of jpegicc ). It is >> working correctly except that the output files are >> more than 3 times the original size. If I try same > > Ok, that is because jpegicc unpacks the data, applies > the color management and then packs the data again, > but sometimes libjpeg has no clue on which level of > compression, quantization tables, etc, to apply.
Take a look at the GraphicsMagick JPEG sources. There is code in there to obtain the original compression and subsampling values. The original values can be reused when the file is saved in order to reduce loss. If the colorspace is changed, reusing the original values may not be suitable. Bob ====================================== Bob Friesenhahn [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
