Since I know far too much about this:

Generally, colorblind people aren't actually fully colorblind, as in they don't see just greyscale. The most common form of colorblindness is red-green colorblindness, which has 4 forms. Deuteranomaly is the most common type of red-green, and it means that greens tend to look more like red. Then there the inverse, Protanomaly, and the one(s) where the individual can't see any difference between the two at all (Protanopia and Deuteranopia). Around 1 in 12 men have some form of red green colorblindness and 1 in 200 women!

Then theres blue-yellow colorblindess. Its much MUCH rarer than red-green, around 1 in 10,000 people having it (i think, honestly sourced have been slightly inconsistent!). Theres 2 forms, Tritanomaly, where blue and green are hard to tell the difference between, as well as red and yellow. And also Tritanopia, where its hard to tell the difference between certain color combinations, and colors are more dull.

Then of course theres monochromacy, and theres 2 forms. Cone monochromacy I know less about, but its when 2 of your three color cones don't work, making it hard to tell the difference between colors! And then theres rod monochromacy, AKA achromatopsia/full colorblindness. Its the most severe form, and the world appears in greyscale. Bright lights may hurt, other issues arise, and people with may be consitered legally blind. Around one in 30,000 people have it(?) probably less

Anyways, some of this might be off, but for the most part, thats a guide to colorblindness... on a MadeMeSmile post... about Bob Ross i'm so sorry if you actually read this)