Textbook Diagrams not displaying correctly

I purchased a university textbook that forces me to use authorised Adobe Digital Editions to view it, however, the images (diagrams) in this textbook are immutable in size, and some of them are too long to display on one page, and because of the way ADE works it just cuts off the diagram and I cannot view the bottom part of it. Anyone got tips on what do I do about an improperly formatted textbook? Ways to resize images?