Here's a code snippet from the php.net documentation on
imagecolortransparent by Blaine Ehrhart
<?php
$im = imagecreatefromgif('trans.gif');
$img = imagecreatetruecolor(16,16);
$trans = imagecolorallocate($img,255,99,140);
imagecolortransparent($img,$trans);
imagecopy($img,$im,0,0,0,0,16,16);
imagetruecolortopalette($img, true, 256);
imageinterlace($img);
imagegif($img,'trans.gif');
imagedestroy($img);
?>
See if it works.
On Thu, Dec 4, 2008 at 10:44 AM, LucaP <lucapost@xxxxxxxxx> wrote:
>
> Hi all, the simple code snippet:
>
> header('Content-type: image/gif');
> $im = imagecreatefromgif("/path/Mypic.gif");
> $background = imagecolorallocate($im, 255, 255, 255);
> imagecolortransparent($im,$background);
>
> imagegif($im,'/path/TransparentPic.gif');
> imagedestroy($im);
>
>
> is creating the new image but is not setting the white background to
> transparent;
> I am sure about the presence of the white color in the background
> (checked it with imagecolorat() etc).
>
> a similarly simple test setting transparency on a new image created
> with 'imagecreatetruecolor()' works correctly... any hints?!
>
> Cheers, Luca
>
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