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All flatbed scanners have minor
inconsistencies in their scanning mechanisms. It should then come as no surprise
that there are areas within the imaging area of your scanner that are better
than others. If possible, you should place your image within this "sweet spot" to
obtain the best and most consistent scans.
Step 1
To determine your own sweet spot simply make a scan of the entire image area using a clean white surface to scan.
Set the resolution low, say 72 spi to 100 spi. There is no need for a huge scan
here!
Step 2
Once in Photoshop, use the Equalize command to exaggerate any minor
differences within the image area. As you can see, my own scanner has dark spots
on the edges as well as a bright streak on the left. In addition, it has a blochy
area about 11" down -- something I have to keep aware of when scanning subtle
images. It is useful to make a cardboard template of the sweet spot to aid you in
future scanning.
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