PNG End Bytes Significance?

[King]

If you want to see a visual representation of where i'm at here it is:


Those chunks removed are just the ones that existed within this (PNG) file. My application can remove other bytes of junk data which can be found in PNG files, but sometimes PNG files can't be compressed at all because no data can be removed or altered, otherwise the file corrupts.

lol 77 bytes difference for this one though.

Now I see what you're doing. And that's actually pretty cool! Think there's some ridiculously complicated, advanced way to reduce them in size by like 90%?