[Openicc] Printing targets: App or driver ? Profiling RGB or CMYK

[edmund ronald]

I don't understand anymore where this is going. Yes Gutenprint can be
profiled in CMYK. There are no technical issues, I have done it, any color
consultant can do it. No, this cannot be done easily with tools available to
hobbyists, and with the current Linux software driving GP, and the quality
one gets with the built-in RGB==>CMYK  I don't think there is an immediate
need to prioritize this route.

Edmund


On Tue, May 17, 2011 at 2:59 PM, Robert Krawitz <rlk at alum.mit.edu> wrote:

> On Tue, 17 May 2011 10:03:26 +0200, Jan-Peter Homann wrote:
> > Hi Alastair,
> > You made a good point. For a smooth step forward, with current available
> tools and settings (Argyll / Gutenprint), you correct, that profiling in RGB
> based on a good Gutenprint RGB->CMYK Setting is easier for crowd profiling,
> which is quite important for the next months.
> >
> > Question to Robert Krawitz:
> > There are a lot of testet Gutenprint settings available, which include
> the Gutenprint specific RGB->CMYK conversion.
> > - Is it possible to create a Gutenprint "CMYK-only" setting by just
> deactivating the RGB->CMYK conversion ?
>
> "Deactivate the RGB->CMYK conversion"?  I don't understand.  If one
> were to do that, they would get RGB output (or perhaps CMY, depending
> upon how it's defined; Gutenprint does offer CMY output).
>
> Based on the rest of this, are you really asking "is it possible to
> determine the internal settings Gutenprint is actually using"?
>
> > - Is it possible to to read easily following parameters from the
> deactivated RGB->CMYK conversion:
> >      - Black generation settings ?
> >      - Total ink limit ?
>
> No, not at present.  I can see API changes that would make it
> possible.
>
> > For stepping into CMYK profiling, this could lead to following workflow
> > - read the Gutenprint settings black geneartion and ink-limit for an
> tested setting
> > - deactivate the Gutenprint RGB-CMYK conversion
> > - Print the testchart
> > - generate profile with similar settings for black generation and
> ink-limit
> >
> > Question to Graeme Gill:
> > Some Ink / Media Combinations need heavy total ink limits. Is it possible
> with Argyll to create CMYK-testcharts which are alraedyoptimize for an ink
> limit and black generation ?
>
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