note 79459 added to function.imagecolorsforindex

While it's quite easy and intuitive to get the alpha transparency of a pixel with: <?php $rgba = imagecolorsforindex($image, imagecolorat($image, $x, $y)); $alpha = $rgba["alpha"]; ?> you should use the return value of the command imagecolorat to get the alpha transparency with the code below because it's much faster and will have a major impact if you process every pixel of an image: <?php $rgba = imagecolorat($image, $x, $y); $alpha = ($rgba & 0x7F000000) >> 24; ?> ---- Server IP: 217.160.72.57 Probable Submitter: 84.159.96.189 ---- Manual Page -- http://www.php.net/manual/en/function.imagecolorsforindex.php Edit -- https://master.php.net/note/edit/79459 Del: integrated -- https://master.php.net/note/delete/79459/integrated Del: useless -- https://master.php.net/note/delete/79459/useless Del: bad code -- https://master.php.net/note/delete/79459/bad+code Del: spam -- https://master.php.net/note/delete/79459/spam Del: non-english -- https://master.php.net/note/delete/79459/non-english Del: in docs -- https://master.php.net/note/delete/79459/in+docs Del: other reasons-- https://master.php.net/note/delete/79459 Reject -- https://master.php.net/note/reject/79459 Search -- https://master.php.net/manage/user-notes.php