Can't copy transparent image. (black background)

[Anton]

I am trying to copy an image into another image.

 

$im = imagecreatefrompng("/oldimg.png"); //this is a semi-transparent image where I want the new image to be copied

imagealphablending($im, 1); //this seems to remove the black background

header('Content-type: image/png'); //outputs old image with a transparent background (YAY!)
imagepng($im);

imagecopy($im, $newimage, 32, 0, 0, 0, 32, 32); //I want to replace a part of the old image with a new semi-transparent image

header('Content-type: image/png'); //outputs image with a black background (noooooooooo!)
imagepng($im);

 

Can anyone help me?

[kicken]

Use the function imagesavealpha to tell GD to save complete alpha channel information to the image.  Otherwise it only does single-color transparency such as what GIFs use.