FM screen
With frequency-modulated screening (non-periodic screening), the halftone dots are distributed pseudo-randomly. Different tonal values result from the varying number of dots of the same size on one surface.
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With frequency-modulated screening (non-periodic screening), the halftone dots are distributed pseudo-randomly. Different tonal values result from the varying number of dots of the same size on one surface.
The Moiré effect or, in other words, a halftone overlay, is a common phenomenon when viewing prints. It occurs when two even patterns overlap unevenly.