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Stochastic screening

Stochastic screening or FM screening is a halftone process based on pseudo-random distribution of halftone dots, using frequency modulation (FM) to change the density of dots according to the gray level desired. Traditional amplitude modulation halftone screening is based on a geometric and fixed spacing of dots, which vary in size depending on the tone color represented. The stochastic screening or FM screening instead uses a fixed size of dots and a distribution density that varies depending on the color’s tone.

Advantages
• The screening of four colors is no longer made with four different angles as with the traditional screen therefore it eliminates screening moiré. • FM screening does not create rosette patterns. • Halftone dot sizes can be as fine as 10 micrometres, which gives the product a quality comparable to that of photographic prints. • The effects of misregistration are not completely eliminated, but the effect is certainly less apparent than in the traditional screening, this feature is very favorable for printing on rotary machines where the misregistration is very common due to effects such as web growth. • The use of FM screening allowed Archant, a UK regional publisher, to switch to fonts with "tiny holes"; such an "eco-font" permitted a reduction in ink without turning fine text grainy. ==Disadvantages==
Disadvantages
The small dots used in FM screening require special care and cleanliness, especially when plates are made from films. == References ==
Source: Wikipedia ↗
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