#20847 [Com]: subimages made from transparent images aren' transparent

ID: 20847 Comment by: gid@gifpaste.net Reported By: gid@gifpaste.net Status: Open Bug Type: GD related Operating System: Debian (sid) Linux 2.4.20 PHP Version: 4.3.0RC2 New Comment: Additional note: If I try to directly copy the transparent png image over the photo image, it works like a charm, it's only when I need to create an intermediate subimage that it doesn't work. Previous Comments: ------------------------------------------------------------------------ [2002-12-05 17:49:10] gid@gifpaste.net I'm running 4.3.0RC2 with the built in gd library. What I'm trying to do is create a transparent subimage from a series of pngs that have an 8 bit alpha channel. I then can resize the subimage, rotate it, whatever over another photograph. I realize there's the imagecolortransparent() function so you can specify one color on your image as transparent, but this does not help the case when you want full 8-bit transparency. Expected results: The subimage should have an 8-bit alpha channel like the png's that's it's created from and should be transparent when imagecopy()'d over the photoimage. Actual results: I get a black box where I tried to copy the image. Web page source: http://pimpbot.qooqle.com/gid/php_bug1/ (example png and jpg images I used are loacated here) Example source: <? // load photo image $photo_img = imagecreatefromjpeg('images/kittybath.jpg'); imagealphablending($photo_img, TRUE); // load just one letter for now to test // this is a transparent png with an 8 bit alpha channel $letter_img = imagecreatefrompng('images/S.png'); imagealphablending($letter_img, TRUE); $x = imagesx($letter_img); $y = imagesy($letter_img); // create the words image, same size as the letter for now // this is also referred to as the subimage, it should also have an 8 bit alpha channel // like the letter_img $words_img = imagecreate($x, $y); imagepalettecopy($words_img, $letter_img); imagealphablending($words_img, TRUE); // copy letter image onto words image imagecopy($words_img, $letter_img, 0, 0, 0, 0, $x, $y); // now that we have the words image, we can resize it, rotate it, etc // but we won't do that for now to keep things simple // copy words image onto photo image imagecopy($photo_img, $words_img, 50, 50, 0, 0, $x, $y); // write out new image imagejpeg($photo_img, 'images/new.jpg', 90); ?> ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=20847&edit=1