Bug #14350 Updated: gd cant handle some png files

ID: 14350 Updated by: aj@haightmail.org Reported By: martin@humany.com Status: Open Bug Type: GD related Operating System: win2000 PHP Version: 4.0.6 New Comment: PHP 4.1.2-1 libgd 2.0.1-7 Apache 1.3.23-1 Linux, Debian Woody with libgd package selected from Sid I experience problems using both ImageCopyResampled and ImageCopyResized on all PNGs loaded with ImageCreateFromPNG. Source images that have a transparent background yield an all black result image, no matter the source and destination sizes. The error is either in ImageCreateFromPNG or the resize/resample functions, I do not know which. Other PNG images yield correct results when the destination size is smaller than the source size, but generate garbage when the destination is larger than the source. JPEGs loaded with ImageCreateFromJpeg, on the other hand, always work. Previous Comments: ------------------------------------------------------------------------ [2001-12-05 08:48:42] martin@humany.com (Im using the official php 4.0.6 build for windows from php.net, only extension loaded is php_imap.dll). I've written a function to rezise images (used for making thumbnails), it's working fine, also with png-files, but not all. Below is the code to reproduce the problem: jul.png is working properly, download from http://inthc.net/jul.png gba_large.png is NOT working properly, download from http://inthc.net/gba_large.png (gba_large.png result in a full blue window, or a full black or gray, it changes upon reload..) gba_large.png was created with Paint Shop Pro 7, and displays fine in IE, Netscape & Opera. ----snip start-- //$filename = "jul.png"; $filename = "gba_large.png"; $inImg = @ImageCreateFromPNG($filename); if (!$inImg) { echo "Failed to open png!"; die; } $size = GetImageSize($filename); $srcW = $size[0]; $srcH = $size[1]; $dstW = 100; $dstH = 100; $outImg = @ImageCreate($dstW, $dstH); ImageCopyResampled($outImg, $inImg, 0,0,0,0, $dstW, $dstH, $srcW, $srcH); header("Content-type: image/x-png"); ImagePNG($outImg); ---snip end-- ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=14350&edit=1