[argyllcms] Re: The different color temperatures: questions: Please look again!

On Thu, 2009-04-16 at 11:34 +0200, "Gerhard Fürnkranz" wrote:
> -------- Original-Nachricht --------
> > Datum: Wed, 15 Apr 2009 14:25:57 -0500
> > Von: Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
> > An: argyllcms@xxxxxxxxxxxxx
> > Betreff: [argyllcms] Re: The different color temperatures: questions
> 
> > I was never able to figure out even what the Brightness and
> > Contrast controls were doing, and which to use at which stage
> > when trying to use dispcal. I suspect for this monitor that
> > the light source was constant and not adjustable and all the
> > controls just adjusted the internal LUT in the monitor, but
> > how seemed rather mysterious.
> > 
> > I am hoping to find it easier working with the XL20 which is
> > an LED monitor. At least it is designed to be calibrated/
> > profiled.
> 
> Well, if the XL20 is used in "Calibration" mode (or in "sRGB" or "AdobeRGB" 
> or "Emulation" mode), you won't have a problem with the meaning of the 
> controls any more, since in these four operating modes, all controls are 
> locked and you can't change them anyway :-)
> 
> [and the setup of these four presets (-> target luminance, white point, 
> gamma, or emulated profile) is to be done with NCE, not via the OSD menu]
> 
> Regards,
> Gerhard
> 

I still haven't found anything from Samsung about the `Color Modes':
Custom, sRGB, AdobeRGB, Emulation, and Calibration,
but experimentation shows, as you say, that only under Custom can you
adjust Brightness, Constrast, or the Color controls.

By googling, I found a review which told me that in Emulation and
Calibration mode that data is loaded directly into the monitor rather
than in the video card.  I presume that something similar happens with
sRGB and AdobeRGB.  I also presume that if I use Natural Color Expert to
do what it calls `Calibrate' and which may be something intermediate
between calibration and profiling, I should have the Mode set to
Calibration.  I don't understand just what Emulation is for, but I
presume it is another way of loading some data determined in another
manner into the monitor.

Finally, I presume all this works only under Windows (or MacOS), and not
under Linux.  If indeed there is some way to load data under Linux
directly into the monitor, I should know about it. Perhaps  ddcontrol,
mentioned by Kurt, can do that, but so far I haven't been able to get it
to compile under Fedora 9 because of problems with the version of
pciutils provided by Fedora. There may have been some discussion of this
matter in some of the posts here that I didn't follow at the time.   I
will go back and look again in the archive, but if anyone can summarize
it for me now, it would be helpful.

In any case, I presume I can use my Eye One Pro together with the argyll
software to calibrate/profile my monitor, and then use dispwin to load
the vgct tag in the videocard as usual.

-- 
Leonard Evens <len@xxxxxxxxxxxxxxxxxxxxx>
Mathematics Department, Northwestern University

Other related posts: