transparent png file have a black background after resize, how to fix it??? please.

[huihuang yu]

Hi all,

Thanks for coming and see my question, i think there must be other people also have seen this issue. when there is a transparent png file, after resize by "thumbnail.php", the background became black!!!!!which looks very bad...

can anyone tell me how to fix this problem?
i have did some research online, most people all recommend use the following code:
+++++++++++++++++++++++++++++++++++
imagealphablending($thumb_img, false);
imagesavealpha($thumb_img,true);
$transparent = imagecolorallocatealpha($thumb_img, 255, 255, 255, 127);
imagefilledrectangle($thumb_img, 0, 0, $thumb_width, $thumb_height, $transparent);
++++++++++++++++++++++++++++++++++++++

but even after i put these lines after line 185 in thumbnail.php, and did clean the cache, still have that issue.

please give some help

[huihuang yu]

Ok, a bit update about my problem,

i check the cache folder, then i found the resized image actually still have the transparent backgound, but the problem is when we display it on the website by "mydomain.com/thumbnail.php?file=file_name.png&size=summary_medi um", it has a black background. Can anyone tell me what is the reason and how to fix it?

much appreciated.

[huihuang yu]

thank god.

it is actually working after i add those lines. i forgot to clean the cache of my browser.