Microtek ArtixScan M1 Pro User Manual page 23

The Descreen tool is used to remove "screens" or moiré patterns from appearing in
images. Moirés are interference patterns that show up on your scanned images when
you scan images from magazines and newspapers. Moiré patterns emerge as a series
of crosshatches or screens crisscrossing in the image.
In the example in previous page, the top image was scanned from a magazine,
resulting in an undesirable moiré pattern. The solution: rescan the image using the
Descreen tool. This will eliminate potential moirés from appearing in the resulting
image as illustrated by the bottom image.