How to remove a Morie pattern

RM
Posted By
Russell_McCollom
Feb 15, 2007
Views
191
Replies
3
Status
Closed
I scanned a photo and restored it but it picked up the tiny bumps on the photo paper and you can see them in the restored photo. How can I reduce or get rid of them.

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B
Bernie
Feb 15, 2007
Hard to say wihtout seeing the image.

Can you post an example?

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PF
Peter_Figen
Feb 15, 2007
That’s not really a moiré pattern. It’s more simply that you’re reproducing the texture in the original photo. You can usually try to minimize the texture with flat lighting when copying or with a scanner that lights from four directions. After that, you’re pretty left up to standard retouching techniques, including cloning, slight blurring, noise addition, etc. It also helps if you are going to reproduce the new version smaller than the original.
RK
Rob_Keijzer
Feb 15, 2007
I sometimes get good result by scanning the document twice (second time 180 degrees rotated.

Then I add the second scan as a new layer, and while temporarily reducing opacity, I carefully adjust the position (Move tool) until it’s in good register with the layer below.

The registration won’t be pixel precise, because mechanical and timing tolerances in the scanner causes a slight difference. (scan at extreme optical res, lets say 600 or even 1200 ppi, and don’t worry about the tolerance).

Opacity back to 100% and blending mode to "Lighten". This does the trick. This blending mode compares pixels from top and bottom layer, and sets whichever is the lightest of the two as the resultant pixel.

This eliminates part of the shadows that make the three dimensional texture visible in the first place.

I had some successful scans this way with a scanner that throws light at an angle. (it should, to prevent glare)

Rob

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