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This is a great idea because it's in that goldilocks zone - pretty easy to toggle but not so easy that I'll disable it for something arbitrary.

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On iPhone I set it to switch between Greyscale and Normal with a triple click of the home button so it's really quick to change if I want to watch a video.

How do you set it to do that?

Settings -> General -> Accessibility Shortcut -> Color Filter.

Thank you!

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