[ Brad (The .NET Guy) @ 12/11/2002 08:31 AM](http://rateyourmusic.com/yaccs/commentsn?blog_id=90000007200&blog_entry_id=158#3820219). The reason you cannot select the compression is because PNG uses a lossless compression system. There's nothing to tweak, unlike JPEG (which is lossy, and therefore you may want to balance size vs. quality). > >
That’s certainly true, but zip files use lossless compression (fortunately ;o)) and I can tweak their compression speed/size when creating them:
-0 store only -1 compress faster -9 compress better > >
So I went looking for something that said either compression on/off or level of compression. Of course, I don’t mind one way or the other, but I was surprised not to get any compression when using 24 bpp (which I was using since it ought to be smaller than 32 bpp) and I didn’t see this documented in MSDN which is the only real reason this is of note (to me, at least).