From: seth at pricepages dot org
Operating system: Mac 10.4
PHP version: 5.2.1
PHP Bug Type: GD related
Bug description: imagesavealpha() has opposite effect on transparent color
Description:
------------
The function imagesavealpha() has an opposite effect on the
output image if the color is marked as transparent. For
example, the code below should always create a clear image.
But it renders as black.
The interesting thing is that if you remove the imagesavealpha
, the image renders as expected (clear).
Reproduce code:
---------------
<?php
$img = imagecreatetruecolor(100,100);
$trans = imagecolorresolve($img,0,0,0);
imagecolortransparent($img, $trans);
imagealphablending($img, false);
imagefilledrectangle($img, 0,0, 100,100, $trans);
//Has opposite affect
imagesavealpha($img,true);
header('Content-Type: image/png');
imagepng($img);
?>
Expected result:
----------------
nothing (a clear image)
Actual result:
--------------
a solid black image
--
Edit bug report at http://bugs.php.net/?id=40601&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=40601&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=40601&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=40601&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=40601&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=40601&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=40601&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=40601&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=40601&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=40601&r=support
Expected behavior: http://bugs.php.net/fix.php?id=40601&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=40601&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=40601&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=40601&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=40601&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=40601&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=40601&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=40601&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=40601&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=40601&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=40601&r=mysqlcfg
