The only thing I can think of would be to open the form in Designer, delete all the other pages leaving the page with the image on it by itself and save it with a new name. Then you could open the new form in Acrobat and save the entire page as an image, there are a couple of different formats available in the Save As drop down list. Once you have the entire page saved as an image, you can open it in the photo editor of your choice, crop out anything else that may be on the page and alter the remaining image. I know it's convoluted, but it's the only way I know of to strip the image out (assuming you have no access to the original image).
djaknow
