Re: Onyx RIP and HPZ6100
Re: Onyx RIP and HPZ6100
- Subject: Re: Onyx RIP and HPZ6100
- From: Graeme Gill <email@hidden>
- Date: Fri, 22 May 2009 08:32:22 +1000
david wollmann wrote:
Where it always fails for me, with any media, is when I try to print a
solid color such as Pantone 2767, a dark navy, I get banding. This
happens with other similar dark navies, some dark purples and also with
some black builds. All media settings match up on RIP and printer.
Different pass modes simply alter the distance between the banding.
What am I missing? Anyone else having problems?
The RIP can contribute to banding in two ways:
Black generation:
If GCR is high, then dark colors will be dominated by the black
channel and any banding present in it. A GCR level in which all
the channels are roughly even minimizes banding.
Multi-level screening algorithm.
An unsophisticated multi-level screening algorithm will
show up banding as the screen starts to get full with one
dot size (or light ink) before starting to add the next biggest
dot size (or darker ink).
A banding aware screening algorithm will avoid this
situation.
My guess is that the second problem is the one you're seeing.
Perhaps you should tell them to contact me - I have a banding aware,
multi-level screening algorithm I could license to them :-)
cheers,
Graeme Gill.
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