This link might help

http://www.php.net/manual/en/ref.image.php

"David P. Schwartz" wrote:
> 
> I need a standard tool that will take an arbitrary image file (probably a
> GIF, JPG, or TIF) and scale it to a fixed size (eg., 150x200 pixels) and
> color depth (eg., 24 bits) from a php script.  Any suggestions?  In case it
> matters, we're running php4 on a Debian 2.2 distro.
> 
> Thanks
> -David Schwartz
> 
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