Re: Dot Simulation
Re: Dot Simulation
- Subject: Re: Dot Simulation
- From: Robin Myers <email@hidden>
- Date: Thu, 15 Jan 2009 18:18:16 -0800
There is no difference between moiré, pattern interference or
interference pattern. They are the same thing; two or more repeating
waveforms that when combined create an interference pattern, at least
that is how my Webster's dictionary defines moiré.
Moiré is just a shorthand term for interference pattern.
Robin Myers
On Jan 15, 2009, at 17:49 , Hal Hinderliter wrote:
On Jan 15, 2009, at 7:36 PM, Graeme Gill wrote:
Of course you can try and be clever on a case by case basis if the
source
and sampling have dominant frequencies, to arrange them so that the
beats (aliasing
products/moirè) are not objectionable (ie. by changing screening
angles, camera
angles, distances, etc.)
Graeme's right on the money here - in fact, I'm surprised that no
one in this esteemed collection of luminaries has yet pointed out
that the effect being discussed is not "moiré" at all, but is more
accurately described as "pattern interference." While the
unpleasant visual phenomena created by improperly angled AM screens
(moiré) shares some attributes with pattern interference, moiré
occurs independently of the sort of content being depicted
(provided, of course, that enough dot appears in the conflicting
screens).
Stochastic does indeed solve this problem, not specifically because
of its randomness, but because it lacks a regular pattern that would
"beat" against the similar-but-slgithly-different pattern seen in
the subject matter.
My 2 cents, anyway.
Hal
--
Hal Hinderliter Consulting Services
2414 N. 83rd St.
Wauwatosa, WI 53213
"Serving the graphic arts industry since the late 20th century"
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