Re: black generation with light black inks
Re: black generation with light black inks
- Subject: Re: black generation with light black inks
- From: Roger Breton <email@hidden>
- Date: Mon, 05 Jun 2006 21:36:35 -0400
Abe,
> ... found that
> PrintOpen seemed to have less ability to create a smooth neutral ramp using
> GCR instead of UCR.
Do you this both on your press and inkjet profiles?
> Using GCR 50% in PrintOpen is identical in neutrals and
> less saturated colors as using UCR with a K length and K width of 10. The
> only differences are in the saturated colors.
You mean the 50% GCR settings and UCR with a K length and K width of 10 are
giving the same neutral CMYK? But different builds in saturated colors?
> I also base my per channel ink limits on a combination of maximum Chroma and
> other common sense things like for Cyan, picking the percent where the a*
> value peaks lowest, for Magenta picking the percent where the b* value is
> still negative or closest to 0 (for K3 insets), and generally not going over
> 100 for the b* on Yellow. If I limit this way, then I generally get no more
> gamut by going beyond 230 - 250 total ink limit. So in essence, even though
> I am not technically using GCR, my proofs are using a lot of black and very
> little CMY and are very GCR like.
Sounds sensible to me.
> I have not tested it or tried to prove it empirically, but we know that
> using more black in a proof should make it less sensitive to different
> illuminants.
I believe the same thing here and, like you, never proved it empirically to
me. But that's my practice exactly.
> Abe Hayhurst
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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