[argyllcms] Re : Re: using ArgylLcms to work around colorSync issues
- From: michael cinquin <safarlebu@xxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Fri, 18 Jun 2010 18:41:41 +0000 (GMT)
Hi Claas
what a good and simple solution you propose ! When I read it I couldn't beleive
I had not tried it earlier.
Unfortunately it does not work : the primaries are not the same (they are off
target when seen on a scope), and the gamma is not perfect either (although
with trial and error, one does get close).
I don't wan't to fiddle around manually with the control in Calibration
Assistant. I do have colorimeters (DTP94, i1pro, and Hubble). I calibrate the
projector using targets. All I need now is Color to behave and send the proper
Colors, just by selecting the appropriate display profile, rather than having
to tweak the vcgt.
cheers
Michael
--- En date de : Ven 18.6.10, Claas Bickeböller <lists@xxxxxxxxxxxxxxxxx> a
écrit :
De: Claas Bickeböller <lists@xxxxxxxxxxxxxxxxx>
Objet: [argyllcms] Re: using ArgylLcms to work around colorSync issues
À: argyllcms@xxxxxxxxxxxxx
Date: Vendredi 18 juin 2010, 15h49
Hi Michael,
maybe I didn't understand your task but if it's only to have a display profile
with "generic" primaries and a certain target gamma you could use the OS X
built-in "calibration" function.
Prefs->Monitor->Colour->calibrate.
Of course this is far from accurate, but better than not doing anything if one
doesn't have a measurement device.
I use it to make quick and dirty "calibrations" for projectors.
Regards
Claas
Am 17.06.2010 um 22:32 schrieb michael cinquin:
> Hi all
>
> I'm trying to work around ColorSync oddities on mac os x, with the help of
> ArgylLcms.
>
> I use Apple Color, which has a strange behavior depending on the Icc Display
> Profile that is chosen in the System Pref -> Display pane.
>
> On Snow Leopard, I have noticed using a scope that when using "Generic RGB
> profile", Color displays accurately the primaries (Red, Green, Blue) and
> secondaries (Cyan, Magenta, Green). But the gamma is wrong : the image is too
> dark.
> If I use "Adobe RGB" as a display profile, Color displays accurately the
> gamma, but not the colors (has been checked with a scope).
>
> I have found a temporary solution : using the display profile "Generic RGB",
> and using dispwin to load a 2.2/1.8 gamma .cal file : this way the gamma and
> the colors are correct.
>
> I would like to make this temporary solution more elegant : either by (A)
> being able to modify the gamma of the "Generic RGB Profile", or (B) by
> permanently adding a vcgt to the icc profile.
>
> Solution A : modifying the gamma of the "Generic RGB" Profile or building a
> generic one from scratch
> - I saw in ColorSync Utility that the Generic RGB profile has response curves
> with a 1.8 gamma, and I was hoping I could find a way to turn them into 2.2
> gamma response curves (rTRC,gTRC,bTRC)
> - I was hoping there would be with synthcal and colorprof some way to build a
> very simple synthetic icc profile, but I failed at finding a way to turn a
> synthetic .cal file into a .ti3 file that could be used by colprof. Is this
> possible ?
>
> Solution B : adding a vcgt to the "Generic RGB profile"
> - I thought I might be able to use `applycal` to add the "2.2/1.8 gamma" .cal
> file to the "Generic RGB profile" (the .cal file is here :
> http://pastebin.com/VAf8M8y0)
> - I tried `applycal -v -a ~/gamma_shift.cal "Generic-rgb_profile.icc
> Generic-rgb_profile_modded.icc`, but got a seg ault
> - so I tried to use a new linear .cal file as a test, built with synthcal -t
> d linear.cal ; but I got a seg fault again
> - I then tried to compile ArgylLcms from source (instead of the 1.1.1
> binaries for Os X on Snow Leopard) : installed jam, cd to ArgylLcms, ran `jam
> -q -f Jambase -j 3`, but only a few binaries compiles (the log of the compile
> is here : http://pastebin.com/xyp5rmSb)
>
>
> I would appreciate if someone could suggest something to make solution A or B
> work, or another solution I had not found.
>
> thanks
>
> Michael Cinquin
>
>
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