Re: Hi-Fi inksets
Re: Hi-Fi inksets
- Subject: Re: Hi-Fi inksets
- From: Graeme Gill <email@hidden>
- Date: Mon, 09 Feb 2004 13:31:17 +1100
- Organization: Color Technology Systems
Robert L Krawitz wrote:
Graeme Gill wrote:
Good point. So to use this type of screening in the real world, it
would be desirable to have the different color planes screens
de-correlated once the dot density grow high enough, thereby
getting the benefits in the highlights where it counts, without
triggering banding and pattern issues.
Why would this *trigger* banding issues? At worst it wouldn't help
solve them, but I don't see how it would actually trigger any
problems.
Because if you have two screens that are correlated, they need to be
printed in
exact alignment (to sub pixel precision) to avoid moiri type effects
between them (assuming
the pixel density isn't sparse). Banding effectively displaces pixels
(generally sub pixel sized
displacements) in a pseudo random "banding" fashion, so moiri effects
amplify the banding
displacements. If the screens are completely uncorrellated, then banding
displacements will
have much less visible effect.
Graeme Gill.
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