How to get an imported image transparent with PHP GD?

Question

I created a PNG image (createimagefrompng()) but the transparency won't work.

How to get this work?

Edit: My script:

<?php
header("Content-type: image/png");
$bg = imagecreatefrompng('banner_bg.png'); // Background Image
$image = imagecreatefrompng('http://<link>/image.png');
$wit = imagecolorallocatealpha($bg, 255, 255, 255, 127);
imagecolortransparent($bg, $wit);
imagealphablending($obe, false);

imagecopy($image, $bg, 0, 0, 20, 13, 80, 40);

imagegif($bg);

imagedestroy($bg);
imagedestroy($image);
?>

------ Sorry for my bad English.

Answer 1

After calling createimagefrompng() you need to call:

imagealphablending($img, true); // setting alpha blending on
imagesavealpha($img, true); // save alphablending setting (important)

Answer 2

You will need to define the transparent color using imagecolortransparent() . Also, you will need to use imagealphablending() to set the alpha blender.