Prepress & Color Control Queries, ZQA

How Moire is eliminated using FM Screening techniques

How do FM Screening techniques solve the Moire problem and what are the advantages of using this method?

FM Screening (frequency-modulated) techniques effectively solve the Moire problem because this method varies the number of dots randomly instead of changing their size (AM). Since FM does not place dots on a regular, angle-dependent grid, the phenomenon of pattern interference, and thus Moire, is completely eliminated. This provides a significant advantage when printing images with very fine details or delicate lines.

However, using FM Screening requires higher precision in the printing process and increases challenges such as Dot Gain and ink control. Technical consultants recommend that the printing team receive specialized training to accurately control ink levels and the CTP when transitioning from AM technology (angle-based). This strategic change elevates print quality when dealing with complex designs and minimizes costs resulting from print waste caused by Moire.

Aligned with: Idealliance / KBA / PIA