#34336 [NEW]: imagerotate destroys transparency information

From: Date: Thu, 01 Sep 2005 19:41:27 +0000
Subject: #34336 [NEW]: imagerotate destroys transparency information
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-84321@lists.php.net to get a copy of this message 
From:             techtonik@php.net
Operating system: Windows 2000
PHP version:      4.4.0
PHP Bug Type:     GD related
Bug description:  imagerotate destroys transparency information

Description:
------------
Imagerotate doesn't preserve transparency information.
Next image was used in example below:
http://img24.imageshack.us/img24/228/spritepaw8alpha2os.png


Reproduce code:
---------------
<?php

$sprName = "sprite_paw8_alpha.png";
$spr = imagecreatefrompng($sprName); //create sprite object

//get sprite's transparent color
$sprTransparent = imagecolortransparent($spr);

//sprite rotation
$rotate = 15;
//rotate sprite, ?keeping transparent pixels
$spr = imagerotate($spr, $rotate, $sprTransparent); 

header("Content-type: image/gif");
imagegif($spr);
imagedestroy($spr);

?>

Expected result:
----------------
Rotated image with transparent background.

Actual result:
--------------
Rotated image with black background.

-- 
Edit bug report at http://bugs.php.net/?id=34336&edit=1
-- 
Try a CVS snapshot (php4):   http://bugs.php.net/fix.php?id=34336&r=trysnapshot4
Try a CVS snapshot (php5.0): http://bugs.php.net/fix.php?id=34336&r=trysnapshot50
Try a CVS snapshot (php5.1): http://bugs.php.net/fix.php?id=34336&r=trysnapshot51
Fixed in CVS:                http://bugs.php.net/fix.php?id=34336&r=fixedcvs
Fixed in release:            http://bugs.php.net/fix.php?id=34336&r=alreadyfixed
Need backtrace:              http://bugs.php.net/fix.php?id=34336&r=needtrace
Need Reproduce Script:       http://bugs.php.net/fix.php?id=34336&r=needscript
Try newer version:           http://bugs.php.net/fix.php?id=34336&r=oldversion
Not developer issue:         http://bugs.php.net/fix.php?id=34336&r=support
Expected behavior:           http://bugs.php.net/fix.php?id=34336&r=notwrong
Not enough info:             http://bugs.php.net/fix.php?id=34336&r=notenoughinfo
Submitted twice:             http://bugs.php.net/fix.php?id=34336&r=submittedtwice
register_globals:            http://bugs.php.net/fix.php?id=34336&r=globals
PHP 3 support discontinued:  http://bugs.php.net/fix.php?id=34336&r=php3
Daylight Savings:            http://bugs.php.net/fix.php?id=34336&r=dst
IIS Stability:               http://bugs.php.net/fix.php?id=34336&r=isapi
Install GNU Sed:             http://bugs.php.net/fix.php?id=34336&r=gnused
Floating point limitations:  http://bugs.php.net/fix.php?id=34336&r=float
No Zend Extensions:          http://bugs.php.net/fix.php?id=34336&r=nozend
MySQL Configuration Error:   http://bugs.php.net/fix.php?id=34336&r=mysqlcfg

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