Posterization filter explained?

[josephh]

Awesome! I am also going to post my code on this thread!

I also found a related topic:

How to apply color quantization to an image

Is there a simple way (preferably a function) to apply color quantization to an image? Specifically I’d like to pick a PImage and an int of colours, and it’d reduce the number of colours to that int, trying to keep it as close as possible to the original. For reference, imagemagick can do it easily (I’d link to it, but discourse isn’t letting me): magick input.png +dither -colors 6 output.png outputs an image with 6 colours. Not shades, but colours. The +dither is actually not doing dithering b…