note 102597 added to function.imagesavealpha

After much trial and error and gnashing of teeth I finally figured out how to composite a png with an 8-bit alpha onto a jpg. This was not obvious to me so I thought I'd share. Hope it helps. I'm using this to create a framed thumbnail image: <? // load the frame image (png with 8-bit transparency) $frame = imagecreatefrompng('path/to/frame.png'); // load the thumbnail image $thumb = imagecreatefromjpeg('path/to/thumbnail.jpg'); // get the dimensions of the frame, which we'll also be using for the // composited final image. $width = imagesx( $frame ); $height = imagesy( $frame ); // create the destination/output image. $img=imagecreatetruecolor( $width, $height ); // enable alpha blending on the destination image. imagealphablending($img, true); // Allocate a transparent color and fill the new image with it. // Without this the image will have a black background instead of being transparent. $transparent = imagecolorallocatealpha( $img, 0, 0, 0, 127 ); imagefill( $img, 0, 0, $transparent ); // copy the thumbnail into the output image. imagecopyresampled($img,$thumb,32,30,0,0, 130, 100, imagesx( $thumb ), imagesy( $thumb ) ); // copy the frame into the output image (layered on top of the thumbnail) imagecopyresampled($img,$frame,0,0,0,0, $width,$height,$width,$height); imagealphablending($img, false); // save the alpha imagesavealpha($img,true); // emit the image header('Content-type: image/png'); imagepng( $img ); // dispose imagedestroy($img); // done. exit; ?> ---- Server IP: 192.41.42.26 Probable Submitter: 108.71.108.206 ---- Manual Page -- http://www.php.net/manual/en/function.imagesavealpha.php Edit -- https://master.php.net/note/edit/102597 Del: integrated -- https://master.php.net/note/delete/102597/integrated Del: useless -- https://master.php.net/note/delete/102597/useless Del: bad code -- https://master.php.net/note/delete/102597/bad+code Del: spam -- https://master.php.net/note/delete/102597/spam Del: non-english -- https://master.php.net/note/delete/102597/non-english Del: in docs -- https://master.php.net/note/delete/102597/in+docs Del: other reasons-- https://master.php.net/note/delete/102597 Reject -- https://master.php.net/note/reject/102597 Search -- https://master.php.net/manage/user-notes.php