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Today's Topics:
1. need NON-color-managed Mac software (edmund ronald)
2. Re: need NON-color-managed Mac software (Klaus Karcher)
3. Re: Betterlight Camera Calibration (Ken Fleisher)
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Message: 1
Date: Sun, 5 Oct 2008 21:46:54 +0200
From: "edmund ronald" <email@hidden>
Subject: need NON-color-managed Mac software
To: ColorSync <email@hidden>
Message-ID:
<email@hidden>
Content-Type: text/plain; charset=ISO-8859-1
Hi Guys,
I need to do some spectral measurement of a display, and hence need
to bypass color management completely in order to bring up white,
black and primary r, g and b screens. Which software should I be using
to do this ? I am on Leopard.
Edmund
------------------------------
Message: 2
Date: Sun, 05 Oct 2008 22:21:13 +0200
From: Klaus Karcher <email@hidden>
Subject: Re: need NON-color-managed Mac software
To: edmund ronald <email@hidden>
Cc: colorsync-users <email@hidden>
Message-ID: <email@hidden>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
edmund ronald wrote:
Hi Guys,
I need to do some spectral measurement of a display, and hence need
to bypass color management completely in order to bring up white,
black and primary r, g and b screens. Which software should I be
using
to do this ? I am on Leopard.
e.g. Firefox 3: type "about:config" into the address bar, search for
property "gfx.color_management.enabled" an make sure that it is set to
"false" (the default setting is false). You have to restart Firefox in
order to apply changes.
you can check the ICC v2/v4 support here:
<http://color.org/version4html.xalter>
Please note that display calibration contained in the vcgt tag of the
display profile remains active, regardless of the color management
capabilities of the application.
You can reset it by using a display profile without vcgt tag.
You can also use Argyll's dispwin tool (e.g "dispwin -n" or "dispwin
-n
-m") to test the native display values.
See <http://www.argyllcms.com/doc/dispwin.html> for details.
Klaus
--
Klaus Karcher * Eichenallee 18
26203 Wardenburg * Germany
Tel. +49 441 8859770
------------------------------
Message: 3
Date: Mon, 6 Oct 2008 01:02:58 -0400
From: "Ken Fleisher" <email@hidden>
Subject: Re: Betterlight Camera Calibration
To: "Stanley Smith" <email@hidden>
Cc: ColorSync Users Mailing List <email@hidden>
Message-ID:
<email@hidden>
Content-Type: text/plain; charset=ISO-8859-1
On Thu, Oct 2, 2008 at 6:34 PM, Stanley Smith <email@hidden>
wrote:
If they
truly are adding the spectral readings from the painting surface into
the mix of patches used to calculate the "scene referred" camera
profile, then they would have to know precisely where these
measurements were taken (down to the pixel), in order to compare the
spectral measurements to the corresponding area of the captured
image.
There does not seem to be a way to do this, given the workflow
diagrams
provided.
Hi Robin, Stanley, and list,
First of all, sorry for being abscent from the thread I started
(I've been
sick). Thanks for describing your product. I think this sounds like a
definte step in the right direction. To answer Stanley's question,
you don't
need the measured camera response because, I assume, it is being
estimated.
This is why you need 1) the spectrum of the illuminant, 2) the
spectral
response curve of the sensors (Betterlight knows their own sensors,
so this
is why it is not a generic solution), and 3) the spectra of the
samples from
the artwork. The camera response (the RGB values) will be an
integration of
these three things. There is likely other optimization happening,
but this
explains why you don't need to know the exact areas on the painting
where
the measurements were taken from.
Ken Fleisher
------------------------------
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End of Colorsync-users Digest, Vol 5, Issue 350
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