Photo product extends the default Zope Image product and add image resizing support.

Thumbnail Support

 You can get a thumbnail copy of a Photo instance by
adding '/getThumbnail' in the request url.
This thumbnail returned is a persistent standard 
Zope Image instance. You can set thumbnail's creation
parameters (height, width, filter and auto refreshing)
into the Photo's property sheet.

Volatile resizing support

 You can also get a volatile copy of the Photo instance
by adding '/getResizedImage' in the request url. The 
default size is (800, 600) px. There is two ways to customize this size :

- pass an optional parameter size = (width, height) to 'getResizedImage'

- set the session variable named 'preferedImageSize' with a tuple (width, height)

note : the request var name must be 'SESSION' (default value of Session Data Manager).