From: ciakana at gmail dot com
Operating system: Windows XP
PHP version: 5.2.0
PHP Bug Type: GD related
Bug description: imagerotate preserve alpha channel only if degree less then 45
Description:
------------
If I run the allegated script, where shade.png is a png image with a
transparent background (full alpha channel), all works if the degrees are
less then 45. If I set the degrees to 300, for example, the background
become black.
Reproduce code:
---------------
<?php
$filename="shade.png";
$degrees =300;
header('Content-type: image/png');
$source = imagecreatefrompng($filename);
$rotate = imagerotate($source, $degrees, -1);
imagealphablending($rotate, true);
imagesavealpha($rotate, true);
imagepng($rotate);
?>
Expected result:
----------------
An image with a black bakground
Actual result:
--------------
A rotated copy of the original image with the alpha channel preserved
--
Edit bug report at http://bugs.php.net/?id=39366&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=39366&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=39366&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=39366&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=39366&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=39366&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=39366&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=39366&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=39366&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=39366&r=support
Expected behavior: http://bugs.php.net/fix.php?id=39366&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=39366&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=39366&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=39366&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=39366&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=39366&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=39366&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=39366&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=39366&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=39366&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=39366&r=mysqlcfg
