Hello. Since all major added support for the Animated PNG (APNG) for a long time, it's resonable to allow to optimize APNG in RIOT.
To get desirable support. First, you can detect whether the PNG image is including acTL, fcTL and fDAT trunks, all of which were key to make the image animatable, they are already documented in the APNG Specification. Second, you can integrating APNG Optimizer from SourceForge, which allows to compress the APNG into smaller size but keep it animatable. So everyone who is using RIOT loyalty would get benifits from this new feature if you can provide it.
Regards.