I got a problem with the dE calculation in the CM module and ACM module.
My aim is to calibrate for 75%amplitude/75%saturation and 75%amplitude/100%saturation, and then use an average of the settings.
I use CP 184.108.40.206946 and builtin patterns.
Problem is: dE calculation in the CM module is widely different from the calculation in the ACM module. See as example the measurement for 75%amplitude/75%saturation.
For the CM measurements, I set 75%REC709 and 75% signal intensity in the signal generator.
For the ACM measurement, I use pattern intensity 75% and baseline, primary and secundary color saturation measurements.
As an example CM shows for yellow dE=0.2% and ACM shows dE=22, although xx,y,Y data for the color and for the grey are basically the same.
See enclosed the data.
Where do I go wrong?
acm.csv 0k .csv file
AdvancedColorManagementReport.xls 404k .xls file
Doc1.docx 254k .docx file
PS: I see that the acm.csv file only shows the ACM secondaries data, and not the grey base. But the data for the grey base in CM and ACM were the same.
Tonight, I tried again and now it worked, but still with a small error.
This morning, I installed the acm macro and started that, but it did not work, so I stopped it.
Because of the problems mentioned above, I made a clean install without
the acm macro update.
Now it works again, but with a small error.
When I calibrate in the CM module for more or less 0 dE on all colours, I still get on average a dE error of 1 in the ACM module (both done at 75%amplitude, 75%saturation).
Then I looked closer and found the following
The CM module puts out for yellow a built-in pattern of 193,193,86.
The ACM module puts out 190, 190, 85.
Checked red, same problem. CM 175, 51, 51 and ACM 173, 51, 51.
Did not check the other colors, but I expect the same problem.
So why the difference, presuming I do things right. Is it a bug? Or an effect of some influence of gamma on target calculation? Which one - CM or ACM - is correct?Edited by turboman123 - 11/6/12 at 4:00am