#34131 [Fbk->Opn]: Artifact left on transparent gifs using image filters

ID: 34131 User updated by: mtjo at conninc dot com Reported By: mtjo at conninc dot com -Status: Feedback +Status: Open Bug Type: GD related Operating System: Win 2K PHP Version: 5.0.4 Assigned To: pajoye New Comment: The following link demonstrates the problem. This is on a RH server running PHP5.04. http://mike.aplosmedia.com/dev/brightness/test_brightness.php Previous Comments: ------------------------------------------------------------------------ [2005-08-16 02:20:41] pajoye@php.net Please provide the sources images, the result images (what you get) and the result you may expect (approximativally). Please use the bundled GD only, your php must be compiled using "--with-gd" not --with-gd=/... Using Gif as output of a filtered image will reduce the quality of any filter... ------------------------------------------------------------------------ [2005-08-16 02:09:03] mtjo at conninc dot com I tried the script with the same results using the following builds. PHP 5.1 Fri, 12 Aug 2005 23:13:30 +0000 PHP 5.04 Mon, 08 Aug 2005 23:22:28 +0000 I noticed that both of those still use the gd 2.0.28 build. I can't find a complied dll for win32 for the latest 2.0.33 build. Since full gif support was again added at 2.0.28, perhaps it is related to this. Is there a php_gd2.dll for the 2.0.33 lib available? ------------------------------------------------------------------------ [2005-08-15 07:35:47] sniper@php.net Please try using this CVS snapshot: http://snaps.php.net/php5-latest.tar.gz For Windows: http://snaps.php.net/win32/php5-win32-latest.zip ------------------------------------------------------------------------ [2005-08-15 06:36:30] mtjo at conninc dot com Should say artifact at x,y:2,1 or x,y:2,2 and width varies. ------------------------------------------------------------------------ [2005-08-15 04:29:51] mtjo at conninc dot com Description: ------------ When using the image filters on transparent gif images, it leaves an artifact at x,y:1,1 that is approx 170px long. It appears to be the background color used when the gif is created in a desktop app. This does not affect transparent pngs. This was tested on PHP5.02 and 5.04 with the bundled gd 2.0.28. See http://mike.aplosmedia.com/dev/brightness/test_brightness.php for an example using the brightness filter. Loaded modules: core mod_win32 mpm_winnt http_core mod_so mod_access mod_actions mod_alias mod_asis mod_auth mod_autoindex mod_cgi mod_dir mod_env mod_imap mod_include mod_isapi mod_log_config mod_mime mod_negotiation mod_rewrite mod_setenvif mod_userdir mod_php5 Reproduce code: --------------- <?php header( 'Content-type: image/gif' ); $filename = 'sample.gif'; // any transparent gif $source = imagecreatefromgif( $filename ); imagefilter( $source, IMG_FILTER_GAUSSIAN_BLUR ); // Set background transparent imagecolortransparent( $source, imagecolorat( $source, 1, 1 ) ); imagegif( $source ); imagedestroy( $source ); ?> Expected result: ---------------- The gif image with filtering and a transparent background. Actual result: -------------- The gif image with filtering and a transparent background with the artifact. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=34131&edit=1