Moir

An undesirable pattern that appears when a graphic image is displayed or printed with an inappropriate resolution. Moir patterns are difficult to predict because they result from a complex combination of parameters: the size of the image, resolution of the image, resolution of the output device, halftone screen angle, etc.

If you’re planning to print a graphic image (particularly a bit-mapped image) on a high-resolution printer, it’s a good idea to print a test page first to see if there are any moir patterns. If there are, you can sometimes eliminate them by changing the resolution of the printout, resizing the image, or changing the angle of the halftone screen.

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