Re: Dot Simulation
Re: Dot Simulation
- Subject: Re: Dot Simulation
- From: Marco Ugolini <email@hidden>
- Date: Thu, 15 Jan 2009 18:13:58 -0800
- Thread-topic: Dot Simulation
In a message dated 1/15/09 5:49 AM, Mike Eddington wrote:
>>> Stochastic Screen is a completely random pattern
>
> Stochastic screening isn't actually completely random, which would
> probably have its own quality issues. With FM screening, proprietary
> algorithms (depending on the originator) are used to place dots in
> optimized positions, preventing repeating patterns, but there is order.
Hi Mike.
Of course, the stochastic dot must fit within the platesetter's raster grid.
It can neither be less than one raster dot, nor fractions of a dot.
If the platesetter images at, say, 2,540dpi, there is one raster dot every
10 microns (1" / 2,540 = 0.0003937" = 0.010 millimeters = 10 microns), which
also happens to be one of the dot sizes commonly used for FM (stochastic)
screening.
Of course, in such a grid there are 100 dots per linear millimeter (254 per
linear inch), which translates into 10,000 per square millimeter, or 64,516
per square inch: a lot of possible positions within a small space,
practically indistinguishable from what one could call a truly random
distribution.
Marco Ugolini
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