Hello @all while trying to calculate a cmyk output profile with colprof (v. 1.3.1) the program reported the following error: segmentation fault. Using the identical parameters in colprof v. 1.3.0 works fine. My command line (Mac OSX 10.4.11, PowerPC): colprof -v - -D"epson x990 spp 240 gmg output (Argyll CMS)" -qm -bm -y -kr -o1931_2 -iD50 -f -r0.5 -s/Library/ColorSync/Profiles/adobe_rgb_1998.icc -S/Library/ColorSync/Profiles/adobe_rgb_1998.icc -nP -nS -cmt -dpp -O/Volumes/Daten/argyll_cms/icc_profiles/printer/epson_9900/epson_spp240_gmg_output/ep_x990_spp240_gmg_output.icc /Volumes/Daten/argyll_cms/icc_profiles/printer/epson_9900/epson_spp240_gmg_output/ep_x990_spp240_gmgOutput I also attached my measurement file. Thank's for all suggestions. -- Vladimir