[argyllcms] Re: brightness scaled down a lot
- From: Graeme Gill <graeme@xxxxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 24 Dec 2008 10:23:11 +1100
Karl H. Beckers wrote:
Am Dienstag, den 23.12.2008, 23:41 +0100 schrieb Karl H. Beckers:
[...]
Suppose this is the culprit?
Is there way to do the math to see what input params will give me a
brightness of around 100?
The gamut of your monitor doesn't permit you to achieve 5000K and the
brightness you've asked for. You would need to measure the native
white point and pick a target closer to the native to have a hope
of this.
Current calibration response:
Black level = 0.57 cd/m^2
White level = 98.69 cd/m^2
Aprox. gamma = 2.41
Contrast ratio = 172:1
White chromaticity coordinates 0.2663, 0.3637
White Correlated Color Temperature = 8523K, DE to locus = 24.7
White Correlated Daylight Temperature = 8479K, DE to locus = 24.3
White Visual Color Temperature = 6474K, DE to locus = 24.5
White Visual Daylight Temperature = 6665K, DE to locus = 24.1
Interestingly enough, the visual impression is much less blueish than
the original ...
The displays native white seems some distance from a black body or
daylight locus. You could try setting your white point target
to (say) 6500 and see what sort of brightness you get.
(This all depends on how accurate your instrument is in combination
with your particular display too. Often colorimeters aren't very
accurate.)
If you mean by "..than the original" the uncalibrated display,
then that could be because channel mismatch was causing the mid
tone color to be quite blue compared to the native white point.
Uncalibrated response:
Black level = 0.56 cd/m^2
White level = 122.37 cd/m^2
You don't have very much brightness range to play with.
Graeme Gill.
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