Creating image from transparent image mangles color

Question

Hello!

I'm building one kind of system, which simply creates dynamic image from other image. I use imagecreatefromstring(file_get_contents("clown_avatar.png")) to create image and output it successfully, but it messes all the colors on the transparent area. Check out the original image:

Click

And here is the result from php-file:

Click

Lol, I'm not good with stackoverflow editor yet, but hope you understood what I was talking about. Please can someone help? I tried to add background-color with imagecolorallocate but didn't effect at all.

EDIT: Here's the source, just few rows.

<?php
$im = imagecreatefromstring(file_get_contents("clown_avatar.png"));
//$bg = imagecolorallocate($im,0,0,0); doesn't effect
Header('Content-Type: image/png');
imagepng($im);
imagedestroy($im);
?>

Answer 1

The reason for this is that you are discarding the alpha layer. By doing so, the otherwise invisible parts of the image now become visible.

What you instead want to do, is load the original PNG image with alpha, and copy it onto a desired image (that is solely the background color) using imagecopymerged.