[Openicc] Fwd: linearisation targets, Argyll, G7

[Jan-Peter Homann]

Hello list, Edmund and Robert
Like limiting the individual channels, the basic linearization of cmk in 
CcMmYKk printers should be independent from CMYK.
But as result, we will have a defined relation of the cmk and CMK for a 
printer / ink / paper setting.
based on this relation we can then drive the CcMmYKk printer as CMYK 
device for profiling or G7 like (re-)linerization.

Regards
Jan-Peter


Robert Krawitz wrote:
>    Date: Thu, 24 Jan 2008 13:03:59 +0100
>    From: "edmund ronald" <edmundronald at gmail.com>
>
>    I think this reasoning is correct, but does not apply in the
>    context of inkjet printers:
>
>    The user model may be RGB or CMYK, but the printer runs natively in
>    CcMmYKk space or something like that. The purpose of the basic
>    linearization is to establish what the abilities of the individual
>    ink-guns are - eg before even the crossover point between K and k
>    gets defined. Thus, measuring the ink-flow out of each *ink-gun* is
>    what a linearisation tool should allow the user to do first,
>    eg. with a step chart for k and a different one for K, and one for
>    both C and c. The values here will assist the user in setting up;
>    heuristically, the ink curves by means of an interactive tool which
>    needs to be constructed.
>
> Gutenprint includes a tool (the test pattern generator, in
> src/testpattern) that could be used for that purpose.  It uses the raw
> interface to the driver (not to be confused with the Raw color
> correction mode, sorry :-) ) which can control the individual ink
> channels independently.
>
>   


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