#43508 [Bgs]: ImageCreateFromPNG does not set transparent color

ID: 43508 User updated by: vbhunt at silverfox dot com Reported By: vbhunt at silverfox dot com Status: Bogus Bug Type: GD related Operating System: Windows XP Professional Ver 2SP2 PHP Version: 5.2.5 Assigned To: pajoye New Comment: This is NOT a bogus bug. Both ImageReady 7.01 and Photoshop 7.01 show alert.png as having an opacity layer with 0% opacity (i.e. 100% transparency) that covers the rectangle not covered by RGB pixels. No alpha channels are shown in either ImageReady or Photoshop. Every single one of the submitted test images properly display with proper png transparency in both IE7 and Firefox3 as well as ImageReady 7.01 and Photoshop 7.01 as was originally reported. Yet the ImageCreateFromPNG function cannot find this transparency. Therefore I continue to conclude that this is NOT a bogus bug. Can you demonstrate any working example that preserves transparency using ImageCreateFromPNG? I suspect not. I have provided you with many examples that cause this function to fail, yet have clear transparency as shown in both the development and display tools. Previous Comments: ------------------------------------------------------------------------ [2008-11-02 18:30:25] pajoye@php.net There is no transparent color (or known as background color). The alert.png for example uses the alpha channel, and the borders of the images is filled with the white color and 100% alpha. A png image can use either the alpha channel or the transparent color but not both. ------------------------------------------------------------------------ [2008-11-02 18:15:25] vbhunt at silverfox dot com Sorry, permissions were changed in a security sweep. I've corrected the permissions so you can get at the images: https://www.republiclocomotiveworks.com/buttons/icons/alert.png https://www.republiclocomotiveworks.com/buttons/icons/<filename>.png replace <filename> with one of the following as the first example shows. alert, group, home, left, mail, right, send, stop, stop1, trash, user Again, thanks for looking at this! /bruce ------------------------------------------------------------------------ [2008-11-02 15:15:24] pajoye@php.net None of the images work, please provide a link to existing images. ------------------------------------------------------------------------ [2008-11-02 13:20:04] jani@php.net Please try using this CVS snapshot: http://snaps.php.net/php5.2-latest.tar.gz For Windows: http://windows.php.net/snapshots/ ------------------------------------------------------------------------ [2007-12-06 06:50:35] vbhunt at silverfox dot com function tinyTranspng( $filename ) { $rsc = imagecreatefrompng( $filename ); if ( $rsc ) { $tpColor = imagecolortransparent($rsc); $msg = "<p align='center' > " . $filename . ( ($tpColor == -1 ) ? " HAS NO TRANSPARENCY.&nbsp" : " has transparency!&nbsp" ); } else $msg = "<p > " . $filename . " is not a png file."; echo $msg; echo "<img src='$filename' border=0 > </p>\n"; } http://www.republiclocomotiveworks.com/buttons/test.php runs the tests on our current web site. This test page generates a call to the above php function for each of the icons in /buttons/icons. The url for each of png icon files is at: http://www.repbuliclocomotiveworks.com/buttons/icons/<filename>.png where <filename> is one of: alert, group, home, left, mail, right, send, stop, stop1, trash, user. Note that RepublicLocomotiveWorks is not yet running PHP 5.2.5 -- we are preparing to upgrade. Regards and thanks for looking at this issue. /bruce ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at http://bugs.php.net/43508 -- Edit this bug report at http://bugs.php.net/?id=43508&edit=1