The preferred way to use images, is to set "intendedResolution". If for example the report should produce it's best output on a 300 DPI device, then set intendedResolution to 300. In this case, an image that is 300 pixels wide will be shown as one inch wide. If however you whish to limit the size of an image by some distance value, then you can do this by setting either x-size or y-size to a fixed value. In either case the image is either enlarged or shrunk to fit the given value while the aspect ratio is preserved (the image will not be distorted). If you specify both x-size and y-size then the image will appear distorted if the pixel size ratio differs from the specified distance ratio.
Kind Regards,
Alex Geller