note 67249 deleted from function.imagecopymerge by bjori

Note Submitter: yonzie at gmail dot com ---- Watermarking for the complete idiot (that would be me, then) My task: Image gallery, automatic resizing, watermarking, etc. I was having huge trouble getting transparency right, but it has finally clicked. This is what worked for me: First, I created a picture in Photoshop with a transparent background. I then copied my logo (except for the background) onto this new transparent picture. "Image > Mode > Indexed color" and "File > Save for Web". Ignore all the stuff about dithering, just make sure there's a checkmark in "Transparency" and PNG-8 is selected. Save and upload. // Set up $file = "path/to/picture.jpg"; // Picture to resize $mark = "path/to/watermark.png"; // The watermark to use. $newfile = "path/to/new/picture.jpg"; // The resized and watermarked picture that we'll end up with. Make sure this directory is writeable. list( $sourcewidth, $sourceheight ) = getimagesize($file); // Size of source photo for resizing list( $markwidth, $markheight ) = getimagesize($mark); // Size of source photo for resizing $width = 800; // Width of picture after resizing $height = 600; // Height of picture after resizing // Load pictures $source = imagecreatefromjpeg( $file ); // Source photo $watermark = imagecreatefrompng( $mark ); // This is our watermark. // Resizing $resized = imagecreatetruecolor( $width, $height ); // Create memory space for resized picture imagecopyresampled( $resized, $source, 0, 0, 0, 0, $width, $height, $sourcewidth, $sourceheight ); // Resize the source picture with a proper algorithm to avoid jaggies. Use imagezopyresized if you are in a hurry. // Watermarking imagecopymerge( $resized, $watermark, 10, $bigheight-$markheight-10, 0, 0, $markwidth, $markheight, 65 ); // Note 65% transparency of the NON-TRANSPARENT parts of the picture. This will put the watermark at the bottom-left corner of the picture, 10px from the edge. // Saving imagejpeg( $resized, "$newfile" ) or die ( 'Could not save picture! Please check permissions.' ); // Save file on disk // Cleaning up imagedestroy( $watermark ); // Clear memory imagedestroy( $source ); // Clear memory imagedestroy( $resized ); // Clear memory