A filter that converts an Image to an ImageReference. The DataSource is expected to
contain an java.awt.Image, the image is then wrapped into an ImageReference and this
ImageReference is returned to the caller.
author: Thomas Morgner
The returned object, unless it is
null, will be an instance of ImageReference.
Parameters: runtime - the expression runtime that is used to evaluate formulas and expressions when computing the value ofthis filter. The value.