I was just about to add some regrettable code to GRiS to deal with certain fools who antialias images against a white background and then leave the actual background transparent - leaving text completely inscruitable if it’s not rendered against a white background (thus negating the point of transparency in the first place!). My hack wasn’t working, so I dug further. Turns out they’re using PNGs - just really, really awfully.

Perhaps antialiasing is the new unicode, where people who care get all uppity because people who don’t are clearly doing it wrong…