[argyllcms] Re: -S command in Colprof for printer profiles
- From: "Alan Goldhammer" <agoldhammer@xxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Tue, 18 Oct 2011 21:26:05 -0400
Graeme,
Thanks for responding. Yes I did read the iccgamutmapping page (several
times). Inkjet printers are simple RGB devices and I understand the linkage
between the monitor profile settings and viewing the print that comes out
from an appropriately profiled printer. I have a Solux lamp next to my
printer and I've calibrated my monitor brightness so that I can match the
print brightness for viewing the results. I know that some colors will be
out of gamut because the working color space of the monitor is greater than
the printer (certainly in the case of ProPhoto and parts of AdobeRGB). So my
fundamental question is that Lightroom is ProPhoto by default and I have
Photoshop set for ProPhoto as well, thus I should create printer profiles
using -SProPhoto.icc since that's what the software is using. I also have a
good knowledge of softproofing and its limitations in terms of choosing
whether to print using "perceptual" or "relative colorimetric" what was/is
confusing is the use of -S and its relationship to my printer.
I did find Gerhard's note useful. I guess where the confusion comes in is
the relation between the various working spaces and whether commerical
profiling products (e.g., X-Rite) address the source space or not when a
profile is created using them.
I think the final question that you pose is something that would be
worthwhile to me in terms of making things clearer (Would a general overview
of the relationship between ICC profile mechanics/nomenclature and device
behavior modeling have avoided the confusion ?)
One final note, the Argyll profiles that I've done for my printer are
excellent and in several cases much better than the paper manufacturer's
provide profile from their website.
Alan
-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Graeme Gill
Sent: Tuesday, October 18, 2011 8:27 PM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: -S command in Colprof for printer profiles
Alan Goldhammer wrote:
> patch targets and read them. How do I handle '-S' when I'm ready to run
> Colprof? We don't know what the gamut behavior of the printer is at this
> point only from research that it's broader than AdobeRGB1998 and smaller
> than ProPhoto. ProPhoto is the default color space for Adobe Lightroom
and
> the recommended color space for Photoshop because of the larger gamut than
> AdobeRGB1998. Does this mean that I should use '-SProPhoto.icc' in my
> command line or use '-nS'.
Yes. -S takes the source gamut as a parameter, and uses it for creating
B2A tables that include gamut mapping. Because these are the B2A tables,
the corresponding destination is the device you are profiling. Naturally
colprof will know the gamut of of the device being profiled, because that
is the data set you are working with. Since it doesn't know which source
profile you intend to link it with later, you have to provide that
information.
Did you discover this ? <http://www.argyllcms.com/doc/iccgamutmapping.html>
> It's not clear to me and assistance would be
> appreciated.
I'd be interested in understanding which bits aren't clear. Is it
the higher level concepts ? Would a general overview of the relationship
between ICC profile mechanics/nomenclature and device behavior modeling
have avoided the confusion ?
Graeme Gill.
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