note 76032 added to function.imagecolorset

C'est la même fonction, mais en mettant imagecolorstotal hors de la boucle, on évite de le recalculer a chaque fois (comme le nombre de couleurs de l'image n'est pas censé changé, il vaut mieux ne faire le test qu'une fois). <?php function imagetograyscale($im) { if (imageistruecolor($im)) { imagetruecolortopalette($im, false, 256); } $total = imagecolorstotal($im); for ($c = 0; $c < $total; $c++) { $col = imagecolorsforindex($im, $c); $gray = round(0.299 * $col['red'] + 0.587 * $col['green'] + 0.114 * $col['blue']); imagecolorset($im, $c, $gray, $gray, $gray); } } ?> ---- Server IP: 195.221.21.36 Probable Submitter: 194.214.24.100 (proxied: 193.51.97.112) ---- Manual Page -- http://www.php.net/manual/en/function.imagecolorset.php Edit -- https://master.php.net/note/edit/76032 Del: integrated -- https://master.php.net/note/delete/76032/integrated Del: useless -- https://master.php.net/note/delete/76032/useless Del: bad code -- https://master.php.net/note/delete/76032/bad+code Del: spam -- https://master.php.net/note/delete/76032/spam Del: non-english -- https://master.php.net/note/delete/76032/non-english Del: in docs -- https://master.php.net/note/delete/76032/in+docs Del: other reasons-- https://master.php.net/note/delete/76032 Reject -- https://master.php.net/note/reject/76032 Search -- https://master.php.net/manage/user-notes.php