Originally Posted by WPWoodJr
So, would one use the plasma color space to adjust the CMS similar to using REC 709 75/75, then go back to REC 709 for final tweaking?
As a follow-up I did a quick test of this theory and using the optimized control points does yield a slightly better calibration than the 75%/75% points as measured using the 96 point color checker:
75%/75% calibration: dEavg=1.29,max=3.64,worst 10%=2.48
Optimized calibration: dEavg=1.09,max=3.57,worst 10%=2.23
After a bit of fiddling with the color and skin tone controls the final numbers were: dEavg=0.81,max=2.78,worst 10%=1.78
The thick white outline in the graph below shows the optimized control points.
Originally Posted by Geoff D
zoyd, ive got another query regarding correction matrices. I've profiled my CM Display against a CM Photo following Larry's instructions and while I was expecting a difference in the colour values what I didn't expect was a 10 cd/m2 difference in measured light output between each meter. Is that right? Or should they both be measuring light output the same?
It's not unusual to see 10% variations between colorimeter and spectrometer measurements of total luminance Y. It will have no effect on your color calibration because everything gets normalized by this value so patterns and targets are always between 0 and 1, independent of the peak white measured.