Re: Color temperature questions : TFT monitor / Spectrocam
Re: Color temperature questions : TFT monitor / Spectrocam
- Subject: Re: Color temperature questions : TFT monitor / Spectrocam
- From: Paul Schilliger <email@hidden>
- Date: Mon, 23 Jun 2003 08:09:26 +0200
email@hidden wrote:
>
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.
Mhhh! That's something I wasn't aware of. Shame on me.
>
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.
Right, that's the way to go.
>
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
Sorry, I meant D50! Should have said Fluorescent. Again, shame on me.
>
> Other question, could someone remind me what is the color
>
> temperature
>
> that the Spectrocam uses for it's printed material readings?
>
>
D50, 2 degree.
Right, this makes sense.
Thank you!
Best regards,
Paul Schilliger
Paul Schilliger Photography
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