[argyllcms] Re: Capture video card gamma LUT to ICC profile
- From: Benjamin Shadwick <benshadwick@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Thu, 2 Feb 2012 07:20:28 -0800
Graeme and Nikolay,
Thanks for the suggestions. Those approaches both sound a bit complicated,
but I'll see if I can get either one to work when I have time.
Since I just care about the LUT, I think any vanilla ICC profile would work
as a base for injection of custom vcgt data. Even though that data is
traditionally just "along for the ride", I think it may be all Windows 7
itself uses directly when applying the profile.
On Thu, Feb 2, 2012 at 1:07 AM, Nikolay Pokhilchenko <nikolay_po@xxxxxxx>wrote:
> Benjamin, You can buld any matrix profile with your calibration data by
> ArgyllCMS colprof and at the next step open this profile with ICC Profile
> Inspector http://www.color.org/profileinspector.xalter to edit the values
> in new profile to exact values from your custom profile.
> I think You can create an RGB test chart with targen -d3, then perform
> fakereading of this chart with including calibratuin data in resulting ti3
> file (fakeread -k filename.cal), then colprof the last. You'll get the
> profile with calibration in vcgtag. You can edit the matrix parameters of
> this profile by ICC Profile Inspector.
>
> 02 fFeb 2012, 11:02 от Graeme Gill wrote:
> > Benjamin Shadwick wrote:
> > > I've used a software calibration utility called CLTest to generate a
> set of
> > > LUT/gamma ramps that bring my cheap TN monitor closer to accurate
> sRGB, and
> > > I would like to get that into an ICC profile so that I can have
> Windows 7
> > > apply it as a system-wide LUT instead of having to depend on various
> > > utilities to keep it uploaded into the video card for me.
> >
> > I'm not sure if it's quite what you want, but you can save the current
> > cLUT using "dispwin -s filename.cal", and then feed that into
> > dispread (dispread -k filename.cal ...) then colprof to
> > create a profile that does what you want.
> >
> > There isn't a tool to set the vcgt tag on an existing profile, but you
> > could fake it using fakeread then dispread using an existing profile.
> >
> > > Being able to dump the video card's current gamma ramp LUT into an ICC
> > > profile would allow users to create custom profiles using any number of
> > > software calibration tools that don't have native support for
> exporting to
> > > that format.
> >
> > Hmm. "Custom Profile" ? Have you read this:
> > <http://www.argyllcms.com/doc/calvschar.html> ?
> > Where is the actual profile information going to come from ?
> > (ie. the display characterisation ?)
> >
> > Graeme Gill.
>
>
--
- Ben S.
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