Combining PNG Images with Transparency

[Shadow Jolteon]

Hello.

 

My friend and I have been trying to combine two PNG format images using this:

<?php
$background = htmlspecialchars($_GET['bg']);
$avatar = htmlspecialchars($_GET['av']);

$av = imagecreatefrompng('img/avatars/'.$avatar.'.png');
$bg = imagecreatefrompng('img/avatars/backgrounds/'.$background.'.png');

$sx = imagesx($av);
$sy = imagesy($av);

imagecopy($bg, $av, imagesx($bg) - $sx - $marge_right, imagesy($bg) - $sy - $marge_bottom, 0, 0, imagesx($av), imagesy($av));

header('Content-type: image/png');
imagepng($bg);
imagedestroy($bg);
?>

Everything works fine, except the transparency of the image is lost. I was just wondering if there is anyone here who knows how to fix this problem.

 

Thanks!

[xtopolis]

Doing a quick google search, try this:

http://us2.php.net/manual/en/image.examples.merged-watermark.php

 

imagecopymerge() instead of imagecopy()

[fooDigi]

i have had the same problem. i used the following code right after i imagecopy'ed them together. depending on gd versions, etc, it may work...

 

# Turn off alpha blending and set alpha flag
imagealphablending($bg, false);
imagesavealpha($bg, true);

 

if it doesn't work, i may help to debug further.

[Shadow Jolteon]

i have had the same problem. i used the following code right after i imagecopy'ed them together. depending on gd versions, etc, it may work...

 

# Turn off alpha blending and set alpha flag
imagealphablending($bg, false);
imagesavealpha($bg, true);

 

if it doesn't work, i may help to debug further.

Awesome, that worked. Thank you very much for your assistance!

 

Thanks to you, too, xtopolis. ^^