I got it to work :)
Like you had recommended, I found a script in http://php.net/imagecolortransparent
from: fmkaiba at optonline dot net
07-Feb-2008 08:05. The function is called, createthumb
Cheers
Graham
On Jan 18, 2009, at 4:46 PM, Jochem Maas wrote:
Graham Anderson schreef:
Hi
I am having problems getting GD to convert a transparent PNG-8 to a
transparent GIF
The below WILL produce a GIF...but leaves a white background
# Convert the PreExisting PNG Image to a GIF
$img = imagecreatefrompng($pngPath);
# Set the GIF to be transparent: Does not seem to work
$trans_color = imagecolortransparent($img );
$trans_index = imagecolorallocate($img, $trans_color['red'],
$trans_color['green'], $trans_color['blue'] );
imagecolortransparent($img, $trans_index );
I can't see the above code doing much useful. the problem is somewhat
more involved, png uses an alpha channel to determine how much
transparency
a given pixel has, with gif a pixel is either transparent or not,
essentially
a given colour in the gif's palette is marked as transparent and all
pixels with that color are therefore shown as transparent.
try the code here (no idea how well it works):
http://demo.pixelsandpages.com/php-tests/images/test.html
and/or dig into the user comments here:
http://php.net/imagecolortransparent
# Save the Image as a GIF in the directory
imagegif($img, $gifAbsolutePath);
Is there another way that works?
Many thanks in advance
G
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