In Canon Digital Photo Professional v4, there is a setting in Preferences | Color management named "Color matching settings" with a group of options "For display". They are:
- Use the OS settings
- Monitor profile
Does selecting "Use the OS settings" mean that DPP will apply the color profile a second time on top of what Windows does?
Here's another way to think of the question.
- Take a high quality IPS monitor and plug it into a Windows 10 computer.
- Make a perfect ICM file from a color calibrator.
- Apply the ICM file using Windows's "Color Management" dialog and confirm that all the colors on the display change a bit after applying them.
- Run Canon DPP with "Use the OS settings" selected
- Look at a photo.
Should the colors all be wrong because the ICM file is being applied two times (once by Windows and once by Canon)? Or are all the colors correct because Windows does not affect the colors displayed by Canon DPP (unless "Use the OS settings" is selected)?