How To Scan Pictures Without Moire
Moiré patterns occur when scanning in a high-resolution image from printed matter like a book or pamphlet. Moiré appears as a striped texture or a rippled effect on top of the image, and is the result of the printing grids overlaid on each other at slightly different angles. Though moiré is inevitable, in most images the difference between the grid angles is so small as to be invisible--hence graphic designers use the term moiré when you can see the effect.
Most see moiré as an undesirable effect. However, moiré can be avoided by scanning in images with a descreening filter.
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Instructions
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Instructions
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Place the image on the scanner. Open up a graphics editing program (like Adobe Photoshop) on your computer. Go to the File menu and select "Import Image." Choose the scanner--the program will open up the scanner software.
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Click on Preview, the scanner will scan in the entire area, and a rectangular outline will appear. Adjust the borders of the rectangular outline until it's close around the image you want to scan.
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Go to the Filters menu and select the "Descreening" filter. Scan in the image. If the scanner program does not offer a "descreening" filter, scan the image in at the highest resolution possible, at least two times the intended image size. Be patient--it will take some time for the scanner to fully capture the image. This will also get rid of moiré, in most instances. When the scanner finishes, the image will open in your graphics editing program. Go to the "Image" menu and select "Image Size." Reduce the image size so it's manageable.
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References
- Photo Credit tissu moiré image by Unclesam from Fotolia.com
