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On iOS, go to Settings > Accessibility > Display & Text Size > Color Filters > Greyscale and then adjust the intensity level as needed. I think that's what you'

On iOS, go to Settings > Accessibility > Display & Text Size > Color Filters > Greyscale and then adjust the intensity level as needed. I think that's what you're asking for? I don't know how to do it on macOS but I'm sure if it's possible, Google knows

Luc 2y ago
Yup, on macOS there's an adjustable greyscale filter under Accessibility > Display in System Settings.
- pcdoodle 2y ago
  A+ Thank you
pcdoodle 2y ago
Thank you. I missed the slider.