For those who want to test their perception of colour, I made a little game called "What's My JND"

https://www.keithcirkel.co.uk/whats-my-jnd/?r=ARUjKP__-ve-

What's My JND?

Find your Just Noticeable Difference in colour perception. How small a colour difference can you actually see?

@keithamus On an iPad Pro with Nanotexture Display + Paperlike protective film (which looked really dirty on some colors and created some "noise"). Touch input using Apple Pencil, so sometimes some px off.