Hi, im having a problem with profile. Depending on the measuredata profile fails with "./profile: Error - set_icxLuLut: Black point powell failed" in xlut.c line 3563. I tried to debug the problem but failed to understand the code. The function powell returns -0.95. This happens on a Canon W8400 that can produce extremely dark black. With 100% black ink only i get a Lab Value of 2.297 3.558 -3.788 and with mixed CMYK black (all inks at 100%) its possible to get a Lab of 0.474 0.012 -0.059. Maybe this has something to do with it. Any ideas? Stefan