DNG Profile Editor question.
DNG Profile Editor question.
- Subject: DNG Profile Editor question.
- From: Joe <email@hidden>
- Date: Mon, 14 Mar 2016 10:13:23 -0700
Hi, everyone.
I hope this message is within the range of topics with discuss here. It’s not about Colorsync but since we discuss color technology here, I thought this may be relevant and within the scope of subjects covered by the forum.
I have started to use the DNG Profile Editor to create a profile for my camera + light combination. All the tutorials I've read and/or watched so far aren't clear about this aspect of the calibration or profiling process. I have used the ColorChecker Classic and ColorChecker Passport (both have the same 24 color patches).
Here is the problem I am having: After I create the profile using DMG profile editor and a photo of one of the targets above, I try to read the value of the color patches but the measurements are very different from those of the patches. I thought and expected that after the profiling process the measurements I took on screen using the color samplers in ACR would display the same values as those on the color charts. For instance, the White patch has a RGB value of R-243, G-243, B-242 on the ColorChecker Classic target but when I measure my image of it on screen the values are R-246, G-245, B-244. Not a big difference here. However, the Black patch has a value of R-52, G-52, B-52 on the ColorChecker Classic target but the measurements on the screen are R-72, G-73, B-74. Just to illustrate my point:
Red on target: R-175, G-54, B-60
Red on screen: R-225, G-68, B-76
Green on target: R-70, G-148, B-73
Green on screen: R-151, G-219, B-119
Blue on target: R-56, G-61, B-150
Blue on screen: R-62, G-86, B-207
Shouldn't the measurements on screen duplicate those on the target now that the camera has been profiled ? In this case what am I doing wrong and how can I improve my calibration process so my measurements on screen are accurate and reflect real life measurements ?
Thank you in advance for your help.
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