note 78379 added to function.imagecolortransparent

This block of code should preserve transparency when resizing an image using the GD library. <?php /** * Try to preserve transparency info * $orig_type - Original Image Type * $orig_img - GD Image Resource for original image * $new_img - GD Image Resource for resized image */ // Transparency only available for GIFs & PNGs if ( ($orig_type == IMAGETYPE_GIF) || ($orig_type == IMAGETYPE_PNG) ) { $trnprt_indx = imagecolortransparent($orig_img); // If we have a specific transparent color if ($trnprt_indx >= 0) { // Get the original image's transparent color's RGB values $trnprt_color = imagecolorsforindex($orig_img, $trnprt_indx); // Allocate the same color in the new image resource $trnprt_indx = imagecolorallocate($new_img, $trnprt_color['red'], $trnprt_color['green'], $trnprt_color['blue']); // Completely fill the background of the new image with allocated color. imagefill($new_img, 0, 0, $trnprt_indx); // Set the background color for new image to transparent imagecolortransparent($new_img, $trnprt_indx); // Always make a transparent background color for PNGs that don't have one allocated already } elseif ($orig_type == IMAGETYPE_PNG) { // Turn off transparency blending (temporarily) imagealphablending($new_img, false); // Create a new transparent color for image $color = imagecolorallocatealpha($new_img, 0, 0, 0, 127); // Completely fill the background of the new image with allocated color. imagefill($this->new_img, 0, 0, $color); // Restore transparency blending imagesavealpha($this->new_img, true); } } ?> ---- Server IP: 216.92.131.65 Probable Submitter: 74.92.61.189 ---- Manual Page -- http://www.php.net/manual/en/function.imagecolortransparent.php Edit -- https://master.php.net/note/edit/78379 Del: integrated -- https://master.php.net/note/delete/78379/integrated Del: useless -- https://master.php.net/note/delete/78379/useless Del: bad code -- https://master.php.net/note/delete/78379/bad+code Del: spam -- https://master.php.net/note/delete/78379/spam Del: non-english -- https://master.php.net/note/delete/78379/non-english Del: in docs -- https://master.php.net/note/delete/78379/in+docs Del: other reasons-- https://master.php.net/note/delete/78379 Reject -- https://master.php.net/note/reject/78379 Search -- https://master.php.net/manage/user-notes.php