[Openicc] Fwd: linearisation targets, Argyll, G7

[Robert Krawitz]

   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.

-- 
Robert Krawitz                                     <rlk at alum.mit.edu>

Tall Clubs International  --  http://www.tall.org/ or 1-888-IM-TALL-2
Member of the League for Programming Freedom -- mail lpf at uunet.uu.net
Project lead for Gutenprint   --    http://gimp-print.sourceforge.net

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