[Feature Request] Image diff option to display pixel differences

[misprintt]

The existing image diff options are great, however they don't work very well for comparing subtle differences (e.g. different versions of the same screenshot)

Image comparison tools typically offer a pixel diff map option that highlights which pixels are different between the two images.

Please consider adding this :)

[DanPristupov]

Image comparison tools typically offer a pixel diff map option that highlights which pixels are different between the two images.

Can you show a few screenshots?

[misprintt]

This example (from https://github.com/yahoo/blink-diff) - shows how it can highlight changes that aren't immediately obvious

Some example libraries that offer this:

• https://imagemagick.org/script/compare.php
• https://github.com/yahoo/blink-diff
• https://github.com/mapbox/pixelmatch
• https://github.com/uber-archive/image-diff

[ZevEisenberg]

Kaleidoscope also does this really well. It has a slider to fade in the diff overlay, so you can get a sense of what parts of the underlying images are different.

[DanPristupov]

@ZevEisenberg

Fork has onion skin too. https://github.com/fork-dev/Tracker/assets/618115/cc228376-fee0-42d7-ac15-5fa70ec3849e

Or do you mean onion skin + diff highlighting?

[ZevEisenberg]

Exactly - sometimes, the diff is too subtle to see in onion skin by itself, so onion skin that fades in the 1-bit diff on top of either the "before" or "after" image would be useful.

Also, the ability to pinch-to-zoom in that view would be useful so you can see individual pixels in a large image.