Roger Breton wrote:
Your figures show that you reached the gamma curves you intended to reach with great precision. Now, have you considered what that does for gray balance? I.e., to gave neutral RGB triplets yielding your desired calibrated white point chromaticities? Like D50 x=0.3457 y=0.3585.
The grey balance tolerance depends on the display, the instrument, and how long you are prepared to wait (ie. which -q flag you use). If you use -u (update/retune and existing calibration) you can even keep trying to improve things as long as you like. If you use the -e flag, it will do a final verify pass that gives you a max/average delta E measure of the neutral accuracy (just like it does for each pass using -v). On a good CRT, you might expect a worst case of 3 delta E or better, and an average of 1 delta E or better. On some LCD's it's hard to adjust for neutral near the black, and the aim points have to be compromised (-k parameter). The next release will address Bill Wood's issues, without changing the type of calibration curve used when a gamma is selected as the target. Graeme Gill.