note 65979 added to function.imagecopyresampled

Creating a thumbnail (120x90 pixel) of a big image (3000x2000 pixel) took me about 5 seconds with imagecopyresampled() Thats pretty much, so I tested a little how I could improve the speed. I found that imagecopyresized is way faster but results in poor quality. So I combined both - I first reduce the big image via imagecopyresized to 1024x768 pixel and then create the small thumbnail via imagecopyresampled. The resulting quality is almost the same. In my tests, resizing took only about 2.2 seconds now - twice as fast :) I also tried using that bicubic image resizing function in some earlier post here, but it was only faster when the thumbnails were smaller than 120x90 and the quality was not very good. Here's the code if you wanna (I guess there are still a few possibilites to do some more optimiztions tough): <?php function CreateThumb($file,$maxwdt,$maxhgt, $dest) { list($owdt,$ohgt,$otype)=@getimagesize($file); switch($otype) { case 1: $newimg=imagecreatefromgif($file); break; case 2: $newimg=imagecreatefromjpeg($file); break; case 3: $newimg=imagecreatefrompng($file); break; default: echo "Unkown filetype (file $file, typ $otype)"; return; } if($newimg) { if($owdt>1500 || $ohgt>1200) list($owdt, $ohgt) = Resample($newimg, $owdt, $ohgt, 1024,768,0); Resample($newimg, $owdt, $ohgt, $maxwdt, $maxhgt); if(!$dest) return $newimg; if(!is_dir(dirname($dest))) mkdir(dirname($dest)); switch($otype) { case 1: imagegif($newimg,dest); break; case 2: imagejpeg($newimg,$dest,90); break; case 3: imagepng($newimg,$dest); break; } imagedestroy($newimg); chmod($dest,0644); } } function Resample(&$img, $owdt, $ohgt, $maxwdt, $maxhgt, $quality=1) { if(!$maxwdt) $divwdt=0; else $divwdt=Max(1,$owdt/$maxwdt); if(!$maxhgt) $divhgt=0; else $divhgt=Max(1,$ohgt/$maxhgt); if($divwdt>=$divhgt) { $newwdt=$maxwdt; $newhgt=round($ohgt/$divwdt); } else { $newhgt=$maxhgt; $newwdt=round($owdt/$divhgt); } $tn=imagecreatetruecolor($newwdt,$newhgt); if($quality) imagecopyresampled($tn,$img,0,0,0,0,$newwdt,$newhgt,$owdt,$ohgt); else imagecopyresized($tn,$img,0,0,0,0,$newwdt,$newhgt,$owdt,$ohgt); imagedestroy($img); $img = $tn; return array($newwdt, $newhgt); } ?> ---- Server IP: 192.35.244.50 Probable Submitter: 194.183.130.253 (proxied: 1.1 KKV-S08) ---- X-Spam-Status: No, hits=3.1 required=5.0 tests=DATE_MISSING,FROM_NO_LOWER autolearn=no version=2.64 ---- Manual Page -- http://www.php.net/manual/en/function.imagecopyresampled.php Edit -- http://master.php.net/note/edit/65979 Del: integrated -- http://master.php.net/note/delete/65979/integrated Del: useless -- http://master.php.net/note/delete/65979/useless Del: bad code -- http://master.php.net/note/delete/65979/bad+code Del: spam -- http://master.php.net/note/delete/65979/spam Del: non-english -- http://master.php.net/note/delete/65979/non-english Del: in docs -- http://master.php.net/note/delete/65979/in+docs Del: other reasons-- http://master.php.net/note/delete/65979 Reject -- http://master.php.net/note/reject/65979 Search -- http://master.php.net/manage/user-notes.php