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Bug #36050 imagecolorallocatealpha returns false
Submitted: 2006-01-17 14:44 UTC Modified: 2009-03-04 10:46 UTC
From: phpbug at phpandmore dot com Assigned: pajoye (profile)
Status: Closed Package: GD related
PHP Version: 5.1.2 OS: Windows NT LAPTOP 5.1 build 2600
Private report: No CVE-ID: None
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 [2006-01-17 14:44 UTC] phpbug at phpandmore dot com 
Description:
------------
When I try to allocate a transparent color as the background of an image, eg: the first color allocated, imagecolorallocatealpha returns false. I am using php 5.1.1, and gd bundled 2.0.28 compatable

Reproduce code:
---------------
$baseImage = imagecreate($_REQUEST['width'], $_REQUEST['height']);
if($trans = imagecolorallocatealpha($baseImage, 255, 255, 255, 63))
	echo 'good';
else
	echo 'bad';


Expected result:
----------------
good

Actual result:
--------------
bad

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 [2006-01-17 15:52 UTC] sniper@php.net 
RTFM: $image=imagecreatetruecolor...
 [2006-01-17 16:11 UTC] pajoye@php.net 
Something is wrong, not in GD but in the casting ops.
 [2006-01-17 16:24 UTC] pajoye@php.net 
Please try using this CVS snapshot:

  http://snaps.php.net/php5.1-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5.1-win32-latest.zip

Fixed in cvs.

You can now use ($trans === FALSE)

Note the "===" usage, zero being a perfectly valid color index, you have to check for both the type and the value (bool and false).
 [2006-01-25 01:00 UTC] php-bugs at lists dot php dot net 
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
 [2009-03-04 10:29 UTC] pajoye@php.net 
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
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.
 
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