[Openicc] Printing targets: App or driver ? Profiling RGB or CMYK
homann at colormanagement.de
Tue May 17 01:03:26 PDT 2011
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 ?
- Is it possible to to read easily following parameters from the
deactivated RGB->CMYK conversion:
- Black generation settings ?
- Total ink limit ?
For stepping into CMYK profiling, this could lead to following workflow
- read the Gutenprint settings black geneartion and ink-limit for an
- 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 ?
Am 16.05.11 19:56, schrieb Alastair M. Robinson:
> On 16/05/11 18:14, Jan-Peter Homann wrote:
>> What is the advantage to profile the printer in RGB-mode, if gutenprint
>> allows it to do in CMYK ?
> Why enforce a colour space at all? Encourage the use of one over
> another by all means, but don't arbitrarily disallow a colourspace
> unless you have *very* good reason.
> It's much easier to create a good RGB profile than it is a good CMYK
> profile; for an RGB profile there's just the three-dimensional colour
> space to worry about. For CMYK you not only have to sample four
> dimensions, which requires way more patches, but you also have to
> consider total ink coverage and black generation functions.
> A good CMYK profile may give slightly better results than the canned
> RGB -> CMYK conversion in the driver (in some cases maybe
> significantly better, but Gutenprint's RGB->CMYK is pretty good), but
> the extra effort required to get there will make it less likely that
> we'll be able to crowd-source profiles.
> All the best
> Alastair M. Robinson
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