Even if you don't think you are color blind, you can test it here https://www.colour-blindness.com/colour-blindness-tests/ishihara-colour-test-plates/
Your monitor needs to be somewhat close to being color correct. To see answers just click on the pattern, not all of them are numbers. If you fail the tests, either you monitor is way out of wack or you are likely color blind. Either way, you would have a problem adjusting your photos.