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All CCD scanners always has distortion due to their mechanism.

for example, my gt x820 has a distortion following the image


this scanner 's distortion must be minimum, since my old scanners have huge visible distortions. e.x. gt s600 has 5% width extention than height. canoscan 5600f has parallelogram distortion.

some distortions might be fixable, so measure your scanner to get better result.