[Zope] How a method only returns the data of an image

[Trevor Toenjes]

I need to make a method act like the clone of an image.
Without extending the Image class...(I would like to do this in DTML or
python-script)
I am simply trying to get a method to return the exact data of an Image
object, so it can be used in normal HTML <IMG
src="myimage.jpg?somevariable">.  If the Image is a method, it can execute
some logic based on the QUERY_STRING.

example:  DTML_Method "myimage.jpg"
# should look and smell like a JPG to the browser (but also execute some
logic without
# effecting the image header data)
----
|  <dtml-call "RESPONSE.setHeader('Content-type', 'image/jpeg')">
|  <dtml-var expr="therealimage.data">
|  <dtml-var somelogic>
----
But this doesn't return the proper data or Content-Length:
"therealimage" is a standard Zope Image object.

Any help is greatly appreciated...
-Trevor