As a reviewer I do not care so much about seeing the difference between the small changes. ( e.g. if the change is 1, 2 or 5 bytes big ). Seeing the difference between a 400byte and 800byte change is way more important.
Normalize small changes in chunks having just a few pixel in height and go logarithmic starting around 50bytes.
By feedback in: https://www.mediawiki.org/wiki/Topic:Tu7w34h8zi8z8ppb
Careful: There might be changes needed once we see this. This is unfortunately a case of "we don't know if this is right, until we see it". So please check back with @Lea_WMDE and WMDE-Design before merging.