[chias]

This has amusing effects on avatar images / pictures of faces. I wasn't quite mentally prepared for what I looked like with non-inverted colors but light shadows and dark highlights.

Edit: This is my dog: https://i.imgur.com/1ECupVA.png

[the8472]

while the invert operation is not truly invertible you can still partially fix this by applying another invert and hue-rotate on images.