Re: HP 10ps buying info
Re: HP 10ps buying info
- Subject: Re: HP 10ps buying info
- From: neil snape <email@hidden>
- Date: Thu, 22 May 2003 16:02:44 +0200
on 22/05/2003 15:30, email@hidden at email@hidden wrote:
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My experience with HP onboard sensors is that they read densities for
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adjusting 2d channel curves for HP's own ink on HPs supported papers.
Yes but custom paper options are in the menus too and it will calibrate to
these densities as well. They are saved in a xml file where you can add or
tag the paper name and a custom profile to.
I
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consider this
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a good way to keep such devices consistant under a profile (be that a canned
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profile or a custom one), but only as long as the system uses those predefined
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components, and the components are consistant. But if you stray outside those
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parameters, then such a system is no longer sufficient.
I don't think there will be any custom inksets for this printer line. The
idea was to keep the price point down and although suggesting only certain
papers , users can use what ever paper they like. Actually within it's scope
the onboard calibration can work for simple custom profiling, of which I've
done many many times on this printer. For more robust linearisations a much
more complete rip is necessary of course , as you say.
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Put in a third party longer life ink (which anyone but a prepress user would
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need to do since the OEM inks are extremely fugitive) and the magenta may be a
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bit more rhodomine, which the sensor can neither detect, nor correct for...
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time for a real color reader and profiler. Similarly, if a media is used which
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prints neutrals warmer or cooler than the canned choices, than your prints
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will reflect this, as there is no correction in this area either.
This printer makes nice loose colour prints as it's designed to do. It's OEM
inks are very very economical which negates any need for third party inks
IMO. Archival inks would be nice to see, yet AFAIK they aren't available.
Normally the profile will try it's best to correct for ink hue differences.
In the end, only correct spectral measurements would be able to linearise
for very un-linear ink hue sets as densiometric correlated values miss hue
changes.
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So my comment was that (while such a system is an efficient way to avoid
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color management, in the larger sense, by using some simplifying assumptions,
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and
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sticking to the elements that make those assumptions reasonably accurate) its
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important not to confuse this shortcut with more advanced solutions, or users
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will start to expect results from it that it is not designed to produce.
As much as Gretag MacBeth would like to have a spectro riding in every
printer you're right in assuming this is a simplistic colorimeter that
accomplishes simplistic densiometric tables for the papers used in it's
simplistic function. That's probably what HP had in mind for this printer,
leaving the prepress specialist to the plotters.
Neil Snape
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