Crystal Enterprise and Crystal Reports consulting and training from The ABLAZE Group, Inc.: "...how to size bitmaps without 'stretching' them out of proportion
You can actually format a bitmap image using the Format Editor. Right click on the bitmap, select Format Graphic, click the Picture tab. On the Picture tab type in the same percentages for width and height. Click OK. The image will have a perfect 'aspect ratio' (the relationship between height and width). "