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Why is this happening?

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Old 04-07-2013, 03:59 PM
ehsteve ehsteve is offline
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Why is this happening?

So my mother-in-law scanned several photos for me to work on, and they all have this problem. I don't know what kind of scanner she has. What might be causing it? And how do I tell her to make it go away?
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Old 04-07-2013, 04:12 PM
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Doug Nelson Doug Nelson is offline
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Re: Why is this happening?

Moire. Try increasing the scan PPI. It's an interference pattern, so "more" might not be the perfect solution. An intermediate number might actually work better. Be aware that the pattern might not be in the actual scan, but in your viewing at less than 1:1.
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Old 05-27-2013, 01:36 PM
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Chain Chain is offline
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Re: Why is this happening?

Ps: Once you've gotten it scanned at a size that doesn't cause moire when viewing it 1:1, you could use an FFT-filter to remove the repeating patterns from important images.
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