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Zubie probably has the 'best' solution. When I used to work in pre-press we found that most scanners has a slight distortion in one axis. After much discussion it was finally decided that it had to do with the optical properties of the surface glass and the lens getting into all kinds of big words like 'achromatic' and optical dispersion. So we as zubie said figured out the correction and used it. Like on my set up here at home at 100% width I need to set the width at around 98% to get it to print out close to correct. Pain in the butt, but having lenses corrected for it was why the lenses on our big cameras to shot the negs for printing plates (remember all that antique stuff) were around $4K.
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