[argyllcms] Re: Combine display and webcam profile
- From: Florian Höch <lists+argyllcms@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Sun, 12 Jun 2011 14:10:47 +0200
Hi again,
Am 12.06.2011 07:42, schrieb kees blom:
thanks, ok I see. Hm I do understand about the profiles: I noticed that
profiling in a normal way and looking through the webcam doesn't make
a difference. But shouldn't it work if I do the entire calibration of the
display looking through the webcam?
No, it won't work. The calibration alone is not enough to get the colors
"right". And as the webcam app is not color-managed as you said, it will
not be able to use a profile anyway, so even trying to create a profile
that describes the behavior of both devices is moot.
The calibration software/window
manager , doesn't know if I'm looking at the actual monitor, or at the
image of the monitor on the webcam, right? If the image on the webcam is
my monitor, all curves should be adjusted so, that the image looks right
shouldn't it? Feedback would be appreciated.
One thing that I think could go wrong is, that there is quite a delay
between the actual monitor and the monitor displayed on the webcam,
as if it's a very slow monitor. (.3 sec or so?) Maybe dispcalGUI is
measuring
a part of the previous patch each time.
dispcal's measuring is synced to the patch display afaik, so anything
that interferes with that can have bad effects.
I attatched the output of xicclu
-g -fb for the
resulting icc file. I don't understand why it looks this bent, while
the curves for monitor and camera (measured with it8 target)
separately look rather straight.... (maybe I'm mixing up curves?)
I will look for a color managed window manager, see if that works
KB
>
> if your camera software is not colormanaged, it means that not only it
> cannot use a camera profile, but also not a display profile as well.
>
> Am 11.06.2011 22:29, schrieb kees blom:
> > I came up with a hacky way to do this today but didn't
> > work unfortunately. Here is what I tried: start dispcalGUI
> > to either calibrate or profile and point the webcam at the
> > computer screen. Install the colorimeter not on the color
> > patch displayed by dispcalGUI, but on the webcamviewer
> > displaying the patch. So dispcalGUI should in theory create
> > the profile/calibration for the camera + monitor, right?
> > The patches displayed by dispcalGUI didn't look much different
> > from the image from the webcam. So I thought it would be
> > just a small adjustment, and it would work
> > but helas... I used guvcview for the cam. Set all
> > options to 'not-automatic' and manually adjust so that there
> > is no 'burn out' , and a black patch is also black when
> > viewed through the webcam.... Unfortunately the result
> > looked much too dark and very blue-green....
>
> Sounds adventurous :) You need a color-managed webcam software and
> distinct profiles for camera and monitor (or a device-link, and a way to
> apply it).
>
> Another option that you could try is using a color-managed
> window-manager (together with a display profile) which assumes sRGB for
> all non-color-managed sources, and then hope that what comes out of the
> webcam software is reasonably close to sRGB. E.g.
>
http://www.oyranos.org/wiki/index.php?title=Oyranos/Download#Oyranos_LiveCD
>
> Regards
>
Regards
--
Florian Höch
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