note 115534 added to function.imagepng

Quality at level 0 can be smaller than 9 (checked in php 5.4), reason is that 1-9 is "zlib compression", but 0 represent "Huffman compression" ("not compression" is a lie). Try both levels and choose better one. Using some external program (like optipng) is also good idea. Imagick extension have also several methods, which you can use to optimize image. You can read more about png compression at http://www.imagemagick.org/Usage/formats/#png_quality ---- Server IP: 46.17.113.50 Probable Submitter: 89.68.93.9 ---- Manual Page -- http://php.net/manual/en/function.imagepng.php Edit -- https://master.php.net/note/edit/115534 Del: integrated -- https://master.php.net/note/delete/115534/integrated Del: useless -- https://master.php.net/note/delete/115534/useless Del: bad code -- https://master.php.net/note/delete/115534/bad+code Del: spam -- https://master.php.net/note/delete/115534/spam Del: non-english -- https://master.php.net/note/delete/115534/non-english Del: in docs -- https://master.php.net/note/delete/115534/in+docs Del: other reasons-- https://master.php.net/note/delete/115534 Reject -- https://master.php.net/note/reject/115534 Search -- https://master.php.net/manage/user-notes.php