[Zope] Generating thumbnails on the fly using PIL

Hi all, I'm trying to make an external method that creates a thumbnail of an image on the fly. I want to give it the url of the image and return the image data. It should look something like: <dtml-var "MakeThumb('/path/to/my/image.jpg', (64, 32))"> I figured out already that I should use a StringIO object to store the raw image data in, so that PIL has an object to work with. The only two things I'm struggling with still are: - How do you get the data of the image in the StringIO object? - How do you return the thumbnail image? Hope that somebody can help with this. Cheers, Pieter