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    Invelos Forums->General: General Discussion Page: 1 2  Previous   Next
Dead space on scanners
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DVD Profiler Unlimited RegistrantStar ContributorAce_of_Sevens
Registered: December 10, 2007
Reputation: High Rating
Posts: 3,004
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Quoting Thargoran:
Quote:
Actually, it's even better to rotate the cover slightly (like 7-10 degrees) before scanning it. This reduces the possibility of a moiré pattern as much as possible. It's better than any "anti-moiré-filters", because they are usually nothing but a (gaussian) blur filter in order to get rid of the moiré patterns, blurring the outcome massively.


I've just taken to slapping it down however in the middle of the tray and using Photoshop's crop & straighten feature.
DVD Profiler Unlimited RegistrantStar ContributorDoubleDownAgain
I see better with 'em on
Registered: March 13, 2007
Reputation: Great Rating
Canada Posts: 1,272
Posted:
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Quoting Thargoran:
Quote:
Actually, it's even better to rotate the cover slightly (like 7-10 degrees) before scanning it. This reduces the possibility of a moiré pattern as much as possible. It's better than any "anti-moiré-filters", because they are usually nothing but a (gaussian) blur filter in order to get rid of the moiré patterns, blurring the outcome massively.

This procedure, in combination with a high-resolution scan (600 dpi or whatever native resolution the scanner has, without interpolation), gives quite some decent results - even with low-end scanners. Scaling it down to the final size should preferably happen in 2-3 steps as one can add some slight (!) sharpen filters with every step, preserving way more details (without over-sharpening the image) than with a one-step downsizing.

Yes, it's slightly more work to do, but the results are decent, even with low budget scanners and without PhotoShop.


Interesting!  I'll have to give that a try next time. a big for you!
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