note 97278 added to function.imagepng

I want to be able to dynamically create navigation images using some user input and imagepng, but I can't get anywhere close to the small file size I can by creating web-optimized pngs with Photoshop - even with compression set to 9. I noticed the information about filters and that it "Allows reducing the PNG file size", but no where can I find any details on how that's done. Any help would be greatly appreciated! ---- Server IP: 216.235.13.26 Probable Submitter: 76.65.30.76 ---- Manual Page -- http://www.php.net/manual/en/function.imagepng.php Edit -- https://master.php.net/note/edit/97278 Del: integrated -- https://master.php.net/note/delete/97278/integrated Del: useless -- https://master.php.net/note/delete/97278/useless Del: bad code -- https://master.php.net/note/delete/97278/bad+code Del: spam -- https://master.php.net/note/delete/97278/spam Del: non-english -- https://master.php.net/note/delete/97278/non-english Del: in docs -- https://master.php.net/note/delete/97278/in+docs Del: other reasons-- https://master.php.net/note/delete/97278 Reject -- https://master.php.net/note/reject/97278 Search -- https://master.php.net/manage/user-notes.php