The Basic Image Action Group 

Provides a basic set of functions for retrieving image objects.

getThumbnail

        returns a small image that can share the viewing space with other images. It is always of type GIF, JPEG or PNG.

getScreenSize

        returns an image that assumes the entire viewing space. It is always of type GIF, JPEG or PNG.

getMaxSize:

        returns the largest image that will be made available. . It is always of type GIF, JPEG or PNG

getDynamicView:

        returns the image embedded in a web page; it is intended to provide the image in an interactive setting. It is always of type HTML.