I was reading that page thinking “what the hell, this is dumb, is this a joke?”. Then I realised which community it was posted in.

ImageMagic can do this with mogrify. You can add it to your term workflow or batch the images at the end.

mogrify -trim +repage *.png

Add -fuzz if the background is a bit not so consistently white.

https://imagemagick.org/command-line-options/#trim

I wish they’d genocide each other for once ffs

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There’s ourphone, which is very active in Telegram working on v2.

https://github.com/evanman83/OURS-project/tree/main/v2