Some possibly relevant bookmarks if anyone is working on something similar - https://clipdrop.co/ - https://cobalt.tools/ - https://gchq.github.io/CyberChef/ - https://ditherit.com/ - https://it-tools.tech/ - https://blgardner.github.io/prism.tools/ - https://www.no-background.coffee/ - https://omnitools.app/. - Source: Hacker News / 7 months ago

Maybe it will be overkill for flags, but you can try with dithering algorithms, where you can select which color you want to keep: Https://ditherit.com/ Https://github.com/noopkat/floyd-steinberg. Source: over 3 years ago

ImageMagick can do anything, but it's a commandline program. There may be some websites that dither images for you - https://ditherit.com/ is one. (I also wrote a program years ago that is excellent at color reduction and dithering, but it's not currently usable.). Source: almost 4 years ago

It’s called dithering. Instead of using many different colors you just choose a few and make the best of it. With using six colors (red, green, blue, yellow, white, black) any color can be matched. You can try it out with this tool: https://ditherit.com/. Source: about 4 years ago

I used https://pixelartselfie.com/en. I later found https://ditherit.com/ which offers more features so I’ll probably do more works. Source: about 4 years ago

If you like that workflow you might love CheepCode[0] which I built specifically to support it! CheepCode connects to Linear and works on tickets as they roll in, submitting PRs to GitHub. [0] https://cheepcode.com. - Source: Hacker News / about 1 year ago