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Preserve PNG transparency/alpha during thumbnail creation. Fixes #2805 props Libertus/Otto42. 

git-svn-id: https://develop.svn.wordpress.org/trunk@6439 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Peter Westwood 2007-12-20 22:24:39 +00:00
parent afd0b9a623
commit 6a0ae6a9ed
1 changed files with 7 additions and 0 deletions
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7
wp-admin/includes/image.php
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@ -33,6 +33,13 @@ function wp_create_thumbnail( $file, $max_side, $deprecated = '' ) {
list($image_new_width, $image_new_height) = wp_shrink_dimensions( $sourceImageWidth, $sourceImageHeight, $max_side, $max_side);
$thumbnail = imagecreatetruecolor( $image_new_width, $image_new_height);
// preserve PNG transparency
if( IMAGETYPE_PNG == $sourceImageType && function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' )) {
imagealphablending($thumbnail, false);
imagesavealpha($thumbnail,true);
}
@ imagecopyresampled( $thumbnail, $image, 0, 0, 0, 0, $image_new_width, $image_new_height, $sourceImageWidth, $sourceImageHeight );
imagedestroy( $image ); // Free up memory