[argyllcms] Re: General Questions
- From: "Michael Nagel" <michanagel@xxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Mon, 24 Sep 2012 19:57:57 -0700
Florian,
thank you for your detailed response.
regarding (1):
I did look at the user logs and found the report when it created when
dispcal created the correction matrix - but there is no information in there
though on the drift of the colorimeter compared to the spectro.
Is this info only coming up when you just created a correction matrix and is
not stored in the user log files ?
regarding (4):
Thanks, I will follow up in the thread in the dispcal forums.
Thanks again.
- Mike Nagel
-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Florian Höch
Sent: Monday, September 24, 2012 8:21 AM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: General Questions
Am 24.09.2012 08:10, schrieb Michael Nagel:
> (1) dispcalGUI does not report the max and average fit error (or any
> other
> report) when creating a correction matrix.
True. But you should be able to see it when you bring up the log window
after creating a correction matrix.
> (4) yes, this is a little bit unclear to me, I'm just trying to
> understand the options and possibilities of the ADVANCED GAMUT MAPPING
> menu (in
> dispcalGUI):
>
> By default in dispcalGUI, under the Advanced Gamut Mapping Options
> menu, the source profile is set to sRGB.icm. I am not sure if it
> actually maps to sRGB if I do NOT make any selections in any of the
> options in the Advanced menu (Gamut mapping for perceptual, Gamut mapping
for saturation, etc.)... ?
You need to tick either of perceptual or saturation (or both) checkboxes
(hmm, perhaps I should gray out the profile selector if not at least one of
the checkboxes is ticked).
> What would I select (or not select) if I want to calibrate my wide
> gamut display to the widest gamut possible (not restrict to sRGB) ?
Selecting a source profile for gamut mapping will not limit the gamut of the
display, it affects the source to destination mapping (i.e. if you process a
lot of sRGB images, it makes sense to choose sRGB as source).
Please note that this sort of gamut mapping will typically improve the
results when mapping from a comparatively large colorspace (e.g.
AdobeRGB) to a smaller destination space (e.g. a display with a gamut
roughly the size of sRGB), and may not be needed if the destination gamut is
large enough to accomodate the gamut of the source colorspace.
> If I do want to map my display to sRGB
I think you may have misinterpreted the options. Choosing a source
colorspace does not map the display to this colorspace, but the other way
around (e.g. to stay in the sRGB example, it affects the conversion from
sRGB images to the display gamut if choosing perceptual intent).
> (or any other color space), what
> would be good, default selections for the options "Gamut mapping for
> perceptual intent", " Gamut mapping for saturation intent" and
> "Default rendering intent for display device profile" ? I am unsure
> what to select here...
In dispcalGUI I've chosen the defaults with a bit of careful experimenting.
In my experience, users seemed to prefer a mapping that gives a result
comparable to relative colorimetric + black point compensation, which is
achieved to some extent by the "Luminance matched appearance" setting. It is
up to you if you also want saturation tables, but if you won't use the
profile with saturation intent (read: if you're not sure you will, you
probably won't), it makes sense to leave it out to cut down on calculation
time when creating the profile.
--
Florian Höch
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