writing images

open an image in firefox, right click, view source.

wtf is that codeing?

It's not code. It's what happens when text editors try to read the bytes of memory used by images.  As they read the file random bits and pieces map to your character set, so that is what you will see: junk.  You wouldn't be able to create a image file the same way, so don't think of it that way.  Get a better browser: one that is smart enough not to let you see an images "source code."