The OP is demonstrably an idiot. He calls himself "Developer, CEO of The Student Cloud", and yet he apparently has no clue whatsoever about the most basic compression algorithms. Zipping compressed images is something that my mother does.
Read his response again. The author is asking why, if Chrome does not support gzipped images, it sends "Accept:/ Accept-Encoding:gzip,deflate,sdch" (in other words it states that it will accept any Gzipped content). This is the question no one in this thread is actually answering, instead choosing to nitpick on why the author tried to do something.
Also, calling someone an idiot because they lack understanding of a certain field in computer science? Really? Maybe you should lighten up.