Re: Color temperature questions : TFT monitor / Spectrocam
Re: Color temperature questions : TFT monitor / Spectrocam
- Subject: Re: Color temperature questions : TFT monitor / Spectrocam
- From: email@hidden
- Date: Sat, 21 Jun 2003 21:40:19 EDT
In a message dated 6/21/03 4:51:53 AM, email@hidden writes:
>
I just switched to a TFT monitor calibrated with BasICColor display.
>
Unlike with Optical, I can no longer set another color temperature
>
without building a new monitor profile for that temperature. Right?
>
With CRTs you can physically adjust the guns to set a "color temperature"
(meaning what color tone white has); doing so invalidates any previous
calibration or profiles, so reusing them after this physical change is not accurate. You
could leave the gun settings alone, and adjust the whitepoint in the LUTs,
which is a shame to do if you don't have to, but it would allow you to display
more than one whitepoint through application of a profile and its LUTs.
With an LCD there is no hardware function that can be adjusted to set the
whitepoint, so any adjustment made is either in the video LUTs, or effecting the
polarization filters over each pixel at one level or another. In this case,
there is really no problem with using different profiles set to different
whitepoints.
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Not
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that it is often needed, but sometimes I need to compare printed samples
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under tungsten light
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To what? A tungesten whitepoint on screen? That would be outside any typical
ICC methodology... whitepoints below 5000k are very problematic, and one down
in the 3000s would be terribly red. OptiCAL does not even allow for
whitepoints below 4000k
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and I rather use a cooler temperature for my daily
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work.
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I would think so!
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I guess that I could build two profiles, one for each temperature
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and assign one or the other in the monitor control panel.
>
As long as no front panel changes were made in the process, yes, that could
be done, as noted above. Whether it should be done is a different matter.
>
>
Other question, could someone remind me what is the color temperature
>
that the Spectrocam uses for it's printed material readings?
>
D50, 2 degree.
C. David Tobie
Design Cooperative
email@hidden
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