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@TengoHipo This looks an awful lot like early 1980s IBM PC CGA colours, maybe you should try converting it to 320x200 in 4 colours, 2-bit colour palette. Just plain white, magenta, cyan, black #ffffff #ff00ff #00ffff #000000

Most people in offices didn't have the luxury of a colour screen though (if they even had a CGA card installed and not just an MDA card that couldn't do any graphics at all, just plain ASCII text) and had to look at their pie charts in four shades of green or amber instead. I wonder if CGA palette 0 (white, magenta, cyan) with background colour 0 (black) as the IBM CGA default was responsible for the use of these colours in so many futuristic airbrush posters of the day, or if that was just parallel evolution.