Re: Controlling 6 or 7 inks on HP10ps?
Re: Controlling 6 or 7 inks on HP10ps?
- Subject: Re: Controlling 6 or 7 inks on HP10ps?
- From: Dick Busher <email@hidden>
- Date: Sun, 27 Oct 2002 06:49:32 -0800
- Organization: Cosgrove Editions
>
Johan Lammens wrote:
>
>
There are two independent issues here: using the native screening
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(halftoning) or not, and having control over black. The built-in PS RIP
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of our DesignJet 5000ps/5500ps has a true four-channel CMYK mode that
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allows full control over K (black ink) but not over the halftoning (you
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always get its built-in error diffusion). It is certainly also possible
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to build a RIP that uses its own halftoning but does not allow control
>
over K, although I don't know of any examples.
>
>
Our internal RIP separates CMYK into CMYKcm,
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i.e. it "splits" the C channel into C and c and the M channel into M
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and m, but the K is straight through. Input CMYK values are only
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affected by ink limiting, which is a function of the media type chosen
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on the front panel, but K is typically not limited at all. Note that
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you need to switch off "Black Replacement", i.e. on the Mac use "Native
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without Black Replacement" mode to get full control over K.
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If you use our internal RIP (without BR), you can and should profile in
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CMYK for best results. I can't and won't comment on competitive
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products, but the same general principles apply, at least in principle
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>
Johan M. Lammens, Ph.D.
>
Senior Color Scientist
>
Hewlett-Packard ICD, R&D Department
>
email@hidden
>
Johan,
Does the built in RIP on the HP10ps have the ability to use "Native without Black Replacement" mode? I
have tried to do this without any success, and tech support has been of no help.
I am on a Mac, OS9.1.
Dick Busher
Cosgrove Editions
888/507-7375
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