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Bug #19133 imagecopymerge doesn't work correctly in gd2
Submitted: 2002-08-27 16:40 UTC Modified: 2002-10-07 15:06 UTC
From: dhunter at ssesco dot com Assigned:
Status: Closed Package: GD related
PHP Version: 4.2.3 OS: Win2K
Private report: No CVE-ID: None
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 [2002-08-27 16:40 UTC] dhunter at ssesco dot com 
Merging transparent PNGs does not work correctly with php_gd2.  The "top" image totally obscures the underlying image.  Expected image would be the same as layering separate transparent PNG files in IE with CSS.


This works correctly in php_gd

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 [2002-08-27 22:16 UTC] sniper@php.net 
Thank you for taking the time to report a problem with PHP.
Unfortunately you are not using a current version of PHP -- 
the problem might already be fixed. Please download a new
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 [2002-08-28 11:11 UTC] dhunter at ssesco dot com 
Same behavior for PHP versions 4.1.2 and 4.2.2
 [2002-08-28 12:27 UTC] kalowsky@php.net 
sample script?
 [2002-08-28 13:02 UTC] dhunter at ssesco dot com 
Sample script:

<?php

$Png0 = "c:\\thumbs\\TERRAIN_color_big.PNG";
$Png1 = "c:\\thumbs\\Z00_LYR3_MAP_T_STATES_CYAN.png";
$Png2 = "c:\\thumbs\\eta_big.png";
$Timg= "c:\\thumbs\\test.png";

$Tim0= ImageCreateFromPng($Png0);
$Tim1= ImageCreateFromPng($Png1);
$Tim2= ImageCreateFromPng($Png2);

ImageCopyMerge($Tim0,$Tim1,0,0,0,0,649,548,100);
ImageDestroy($Tim1);
ImageCopyMerge($Tim0,$Tim2,0,0,0,0,649,548,100);
ImageDestroy($Tim2);
ImagePng($Tim0,$Timg);
ImageDestroy($Tim0);

?>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<STYLE><!--
.LYR0 {position: absolute; TOP:800; LEFT:10;z-Index:0; }
.LYR1 {position: absolute; TOP:800; LEFT:10;z-Index:1; }
.LYR2 {position: absolute; TOP:800; LEFT:10;z-Index:2; }
--></style>
</head>
<body>

<!-- display the composite image -->
<img src=<?php echo "$Timg"; ?>><br><br>

<!-- for comparison, display the PNGs layered atop one another -->
<span class=LYR0><img src=<?php echo "$Png0"; ?>></span>
<span class=LYR1><img src=<?php echo "$Png1"; ?>></span>
<span class=LYR2><img src=<?php echo "$Png2"; ?>></span>

</body>
</html>


Note that with php_gd2, the composite image "$Timg" ends up identical to $Png3.  With php_gd, it looks identical to the three PNGs layered atop one another using CSS (which is what I believe to be the proper behavior).
 [2002-08-28 13:57 UTC] sander@php.net 
This might be fixed with the bundled verion of GD2 available with 4.3.0. Please try a snapshot from http://snaps.php.net.
 [2002-08-29 16:32 UTC] dhunter at ssesco dot com 
Sorry, we have to stick with version 4.2.2 for now.  

Can anyone think of any possible workarounds?
 [2002-10-06 02:08 UTC] rasmus@php.net 
I verified that this works correctly in the bundled GD2 in PHP 4.3.
 [2002-10-07 14:13 UTC] dhunter at ssesco dot com 
I tried this in 4.2.3, and my tests still fail.  Can you tell me what you did in your tests?
 [2002-10-07 15:06 UTC] rasmus@php.net 
I said 4.3, not 4.2.3.  I used 4.3 built using --with-gd=php

In 4.3 we forked the GD library so we could start fixing some of the oodles of bugs in it.
 
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