Bug #70102 [Ana->Csd]: imagecreatefromwebm() shifts colors
Edit report at https://bugs.php.net/bug.php?id=70102&edit=1
ID: 70102
Updated by: cmb@php.net
Reported by: cmb@php.net
Summary: imagecreatefromwebm() shifts colors
-Status: Analyzed
+Status: Closed
Type: Bug
Package: GD related
Operating System: *
PHP Version: 5.6.11
Assigned To: cmb
Block user comment: N
Private report: N
New Comment:
Automatic comment on behalf of cmb
Revision: http://git.php.net/?p=php-src.git;a=commit;h=a31fe58d8005ff47f8f6ad095dcd4fb3a2f0aae9
Log: Fix #70102: imagecreatefromwebm() shifts colors
Previous Comments:
------------------------------------------------------------------------
[2015-07-19 17:34:52] cmb@php.net
As has been already pointed out in the upstream ticket, this is
because libgd uses ARGB internally, but the colors are set as
RGBA.
------------------------------------------------------------------------
[2015-07-19 17:32:45] cmb@php.net
Description:
------------
When reading images with imagecreatefromwebp() all colors are
shifted.
This issue has already been reported upstream against libgd:
<https://github.com/libgd/libgd/issues/83>.
Test script:
---------------
<?php
$im = imagecreatetruecolor(8, 8);
$white = imagecolorallocate($im, 0xff, 0xaa, 0x55);
echo sprintf("%08x\n", $white);
imagefilledrectangle($im, 0, 0, 74, 74, $white);
imagewebp($im, 'test.webp');
imagedestroy($im);
$im = imagecreatefromwebp('test.webp');
echo sprintf("%08x\n", imagecolorat($im, 4, 4));
imagepng($im, 'test.png');
?>
Expected result:
----------------
00ffaa55
00ffaa55
Actual result:
--------------
00ffaa55
ffab5500
------------------------------------------------------------------------
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Edit this bug report at https://bugs.php.net/bug.php?id=70102&edit=1
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