Hello Huang, Allen Huang schrieb:

I'm been playing around with python PIL library for a while now

but I'm confuse about how to dynamically generated image or modified an image, create a new image object, and save it back into zope database.

can someone walk me through the steps?

the example code in the zope book, chapter "Advanced Zope Scripting", section "Using External Methods" is a working example of how one can generate/modify images with zope using PIL. It's well documented as well. Greetings Roman