I am relatively new to color management. I am using a Huey with argyll (thank you very much Graeme for fixing the detach_kernel issue in the latest release). At home (running fedora), I calibrated and profiled my older Samsung CRT and it looks very, very nice: grey ramps are neutral and smooth; colors are accurate compared to prints, shadows begin to be visible at level 2 (RGB). The profile looks great in Gimp, Cinepaint, and ufraw. At work, I have windows Vista and two dell 2007FPb LCD panels. They both calibrated nicely and the calibration looks good (shadows distinguishable at level 3, smooth neutral grey ramps). However, I'm having problems profiling them. Here is what I have done on each: dispcal -yl LeftLCD targen -d 3 -f 64 LeftLCD_stage1 dispread -yl -k LeftLCD.cal LeftLCD_stage1 profile LeftLCD_stage1 targen -d 3 -f 1500 -c LeftLCD_stage1.icm LeftLCD dispread -yl -k LeftLCD.cal LeftLCD profile LeftLCD After all that, profcheck shows that the resulting profile matches the .ti3 files nicely: > profcheck LeftLCD.ti3 LeftLCD.icm Profile check complete, errors: max. = 2.211633, avg. = 0.456926, RMS = 0.530626 > profcheck LeftLCD_stage1.ti3 LeftLCD.icm Profile check complete, errors: max. = 1.503398, avg. = 0.546533, RMS = 0.630108 However, in the resulting profiles the shadow area is pushed toward black. The first viewable black level is around 21 (RGB). This is not at all like the results on my CRT at home. Here is a screenshot of the drycreekphoto sensitivity test chart through the profile and straight in Gimp. Also included are the xicclu grey axis plots for the LCD profile and the same plot for my CRT profile at home: http://dave.wagner.googlepages.com/Profile_issues.jpg I've tried using profile -k z and profile -k x and they seem to have no effect on the shadow levels (maybe because these switches are for CMYK?). So, what am I doing wrong? Or, is it correct for it to flatten out the shadows?
