Bad rendering of PNG image

Issue #39 invalid
Anonymous created an issue

if you take the image attached and run it through this code you will get the 2nd attachment. Note the blue background which should not be there.

Code:

<?php
    $image_url= image_URL.png';
    $data=  file_get_contents( $image_url, false, null, -1, 500000); 

    $image= imagecreatefromstring  ($data);
    header("Content-type: image/png");
    imagepng($image,null,4);
    imagedestroy($image);
?>  

Gd version tested:

GD Support enabled
GD Version 2.0
FreeType Support enabled
FreeType Linkage with freetype
FreeType Version 2.4.8
T1Lib Support enabled
GIF Read Support enabled
GIF Create Support enabled
JPEG Support enabled
libJPEG Version unknown
PNG Support enabled
libPNG Version 1.2.46
WBMP Support enabled

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