Great effort and reason to create this! I'm accustomed to using the Magic Wand tool in Paint.net[1] and Pinta[2] to select pixels based on color. Any chance you could add that functionality?

[1] https://www.getpaint.net/doc/latest/MagicWand.html

[2] https://www.pinta-project.com/user-guide/wand/

Looks nice, thanks for sharing.

I'm using Affinity v1 for some specific photo manipulation work, and the workflow is a bit convoluted.

Very tempting to make a specialized tool like this for that.

The name of this project brought many memories of the HP 48G to the forefront of my mind, after so many years. Its 1 bpp pixelated icons and drawings were indeed called GROBs - there are collections of these online. What a coincidental but fine name for a pixel-capable graphics editor.

I'm still looking for something like paint.net on MacOS, any recommendations?

Grob is either Slavic cognate for "coffin" or German for "rough" :)

Looks minimalistic and nice to use. I might try making a pixel icon for my app with it.

Do you really need that Python script? I think you could end up with a nicer user experience if you rewrote those 264 lines to JS with Electron.