[argyllcms] Re: dispcal VDT DE 2K measurement discrepancy
- From: Vallo Kallaste <kalts@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 16 Dec 2014 18:56:55 +0200
On Tue, Dec 16, 2014 at 09:44:57AM +1100, Graeme Gill <graeme@xxxxxxxxxxxxx>
wrote:
> Vallo Kallaste wrote:
>
> > I noticed that dispcal VDT DE 2K measurements are always off by small
> > amount.
> > By the measurements I mean those in the interactive display adjustment menu:
>
> I'm not sure what you mean.
>
> > 5) Check all
> > Current white = x 0.3263, y 0.3431, VDT 5750K DE 2K 0.8
>
> > 2) White point (Color temperature, R,G,B, Gain/Contrast)
>
> > / Current Br 105.84, x 0.3263+, y 0.3421- VDT 5770K DE 2K 0.1 R= G= B=
> > q
>
> It's not unexpected that they have different DE's because the white point has
> changed
> between the measurements - i.e. y .3431 vs. .3421.
>
What I mean is that those two measurements, made in menu points 2) and 5),
never seem to converge. The measurements are only few seconds apart.
What lead to my question was simple flow of events (used -N switch):
* I executed dispcal and launched menu point 2)
* I set monitor G channel two steps lower to adjust native WP
* I launched menu point 5) to check and found that DE 2K is off by 0.7 units
* I launched menu point 2) again and confirmed that DE 2K is indeed still 0.1
* I launched menu point 5) and confirmed that DE 2K check here is still off
0.7 units, showing 0.8
Hope this makes sense. My assumption was that two WP measurements made few
seconds apart would show same DE 2K numbers. I could be wrong, nothing wrong
with that :) It has been long time since I last used interactive adjustment.
--
Vallo
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