I have to agree with the OP here. Making this a webpage is silly. If it were a library the program that created the PNG could have saved it in this compressed

I have to agree with the OP here. Making this a webpage is silly. If it were a library the program that created the PNG could have saved it in this compressed form in the first place. Choosing the language isn't an issue, either. The obvious choice is C because that's what regular libpng is written in. And every language in existence provides a way to interface with C.