Moire – One Reason Scans may have Lines and Dots

Back when we were testing scanners, the clue that led me to discover the low scanning resolution of one particular scanner was what I later learned was something called moire. Some images scanned just fine, but scanning an image containing a brick wall brought out a moire pattern. The pattern exacerbated the scanning pattern.

moire_brick_wall

Sample of moire on scanned image

Instead of re-explaining what others have done, I’m sharing the following two websites which I found extremely helpful in explaining the problem and providing tips for avoiding and fixing moire patterns.

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