I think that only JPEG JPG and PNG are supported currently. Am I correct?. And I know that you’ll add more formats, but I wonder which ones and if there’s a roadmap.
As a suggestion: I would include BMP (because lots of people still use it) and PSD (because it is a relatively common format for storing images without compression AND I bet lots of artists and designers will use Tropy), WEBP would be nice. Of course TIFF is pretty much necessary, but that’s already been mentioned.