As a conventional method of color camera calibration, I use following procedure
- Take a raw image of Xrite ColorChecker passport in a given light and exposure, and convert it to DNG file.
- Use Xrite software to create DNG camera profile using the image taken in Step 1.
- After loading the DNG camera profile in ACR, perform camera calibration after white balance.
I know something can go wrong in this procedure, but let's assume everything in the process was done accurately for now.
My question: what is the best process of validating this camera calibration?
Naturally, I tried to apply the profile to the image of Colorchecker passport, and examine XYZ values of patch area in the image with values calculated from reference values of corresponding color patch that Xrite provides with. But the difference between corrected and reference values seems to be large (> 20). I wonder if there is any better way to validate calibration result? Any advice will be appreciated.