This was the article that inspired me to study the MacPaint format. I ended up writing first a Python program that can do Atkinson dithering of a modern image and then save it as a MacPaint file for display on a retro Mac. That code is a chapter in my upcoming book. I then added 9 more 1-bit dithering algorithms and turned it into a Swift/AppKit app so it's easy to use if you want to Atkinson dither your own images and transfer them over to your retro Macs:

https://apps.apple.com/us/app/retro-dither-b-w-is-beautiful/...