Re: Colorsync-users Digest, Vol 6, Issue 5
Re: Colorsync-users Digest, Vol 6, Issue 5
- Subject: Re: Colorsync-users Digest, Vol 6, Issue 5
- From: Brian Lawler <email@hidden>
- Date: Thu, 15 Jan 2009 10:33:22 -0800
Hi everyone,
Stochastic screening techniques are largely free of the risk of moiré
patterns.
But, beware! It is still possible to get a moiré pattern. The latest,
and most successful patterns are hybrid screening techniques, and
these have a combination of stochastic paterns (highlights) and
conventional dots in the shadows.
The halftone angles have to be correct for these to work without moiré.
But, don't worry – the sophistication of the screening algorithms is
so good on systems that do this, it's almost a moot point.
Pure stochastic screens also can create a moiré if you are generating
film and you get one of the films slightly askew.
But, that's rare... so don't worry about it.
The Kodak Trendsetter Quantum machines make breathtaking plates,
driven by Prinergy or Apogee they can make stochastic or hybrid
halftone patterns, and the results are fabulous.
The thing to remember is that stochastic patterns are not truly
random. They approach randomness, but they are still capable of making
a pattern that can cause interference.
The other thing to remember is that even stochastic patterns must fit
into the cell structure of a conventional halftone, so even the
pseudorandom patterns exist within a frequency-fixed cell module.
Marvelous technology!
Best wishes,
Brian P. Lawler
Brian P. Lawler
Graphic Arts and Photographic Consultant
1329 Peach Street
San Luis Obispo, California 93401 USA
Tel: 805 544-8814
Fax: 805 544-8445
E-mail: email@hidden
Web: www.thelawlers.com
__________________________________
"Live so that when your children think of fairness, caring, and
integrity, they think of you."
– H. Jackson Browne Jr.
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