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Bug #33125 imagecopymergegray produces mosaic rainbow effect
Submitted: 2005-05-24 13:50 UTC Modified: 2005-09-30 22:59 UTC
Avg. Score:5.0 ± 0.0
Reproduced:2 of 2 (100.0%)
Same Version:2 (100.0%)
Same OS:2 (100.0%)
From: thomas at krantz dot com Assigned: pajoye
Status: Closed Package: GD related
PHP Version: 5.0.4, 4.3.11 OS: Linux
Private report: No CVE-ID:
 [2005-05-24 13:50 UTC] thomas at krantz dot com
When merging two images, one normal and the other one completely black, the output from imagecopymergegray produces a weird looking mosaic of the first.

Reproduce code:
$imPng = imagecreatefrompng("Tiles/Bamboo/9.png");
$imSrc = imagecreatefrompng("Tiles/Bamboo/black.png");
$height = imagesy($imPng); 
imagecopymergegray($imPng, $imSrc, 0, 0, 0, 0, $height, $height, 50);
header("Content-type: image/png");
See also

Expected result:
The original image should be darkened by 50%. This was the result in the earlier version (4.3.10).

Actual result:


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 [2005-09-30 22:59 UTC]
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
Thank you for the report, and for helping us make PHP better.

Fixed in all cvs branches, thanks for your feedback.
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