Remove Moire on Scans

Images in print media represent a series of overlapping dots that should create an illusion of more colors. When you scan such a photo you can usually discover a moire pattern. A moire pattern results from incorrect screen angles of overprinting halftones.

You can try to avoid moire at the scanning stage. Sometimes a well-chosen scan angle can produce a remarkable effect. However, if you deal with a scanned image you have only one method of moire suppression at your disposal - apply image processing techniques.

Original scan image
Original Image
Result: moire was removed

On the photo below you can see a scan of a music CD cover. Moire is visible.

Fragment of a scanned CD cover with moire


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