Which version of CR are you using? In my experience, in XI you cannot get the image to maintain its aspect ratio (i.e., proportions) and stay confined to the graphic box. For me, when I select "Can grow" the proportions are correct but the image often expands outside the graphic box. One report that I wanted to create calls different images for each detail record. Some are square, some are horizontal rectangles and some are vertical rectangles. I cannot create this report with CR because, depending on the options selected, either the images are reformatted to fill the graphic box (and therefore some are distorted) or they have the correct proportions but may be enlarged and thus destroy the formatting for the rest of the report.