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 1 year 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 2 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 2 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 2 years ago

Check this website: https://ditherit.com/. Source: about 2 years ago

Get a residential vpn, silly, normal vpns will keep you banned. Try tuxlervpn.com or a static ip from proxy-cheap.com. Source: 12 months ago

Download tuxlervpn.com and use their residential ip - unbanned. Source: about 1 year ago

Use https://tuxlervpn.com and setup the residential vpn, its $7.99/mo, 140 countries, 80,000 IPs -> switch location if banned, easy. Source: about 1 year ago

Tuxlervpn.com is a free residential vpn, just switch your location until you get one thats not banned - probably takes 2 location switches. you'll find tht turkey, netherlands and saudia-rabia are the best to use. Source: about 1 year ago

Tuxlervpn.com will bypass this, true residential connections in any country. Source: about 1 year ago