I say 90% because the latest EpsonScan2 software doesn't let you define percentage sizes while the old EpsonScan software does. (see comparison in the photo). Taking off a star because it annoys me when "upgrades" are inferior to the previous version. Yes the scanner comes with Silverfast which is very sophisticated software that allows you to measure size by percentage but it is more than I need and the older software was more intuitive and had everything I needed without the extra Frills. Of course the old software doesn't work with this scanner and my OSX. By the way, I'm an illustrator and I use a scanner for high resolution finished drawings. The scanning is excellent and it's the only professional scanner of its kind, so I still recommend it to professionals.
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