[argyllcms] Re: brightness scaled down a lot
- From: "Karl H. Beckers" <karl.h.beckers@xxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 23 Dec 2008 23:57:44 +0100
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?
[...]
OK, OK, been playing with this some more ...
there is one easy way to get to ~ 100 cd/m^2 for me, i. e. set no other
target value. So, if I do:
./dispcal -v -d1 -c1 -yl -p0.0731707317073,0.251984126984,1.0 -ql \
-m -b100 -f0 -k0 bla
... I get:
> 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 ...
> Uncalibrated response:
> Black level = 0.56 cd/m^2
> White level = 122.37 cd/m^2
> Aprox. gamma = 2.74
> Contrast ratio = 220:1
> White chromaticity coordinates 0.2672, 0.3657
> White Correlated Color Temperature = 8427K, DE to locus = 24.7
> White Correlated Daylight Temperature = 8383K, DE to locus = 24.3
> White Visual Color Temperature = 6404K, DE to locus = 24.5
> White Visual Daylight Temperature = 6607K, DE to locus = 24.2
> Effective LUT entry depth seems to be 12 bits
... (which is good), though I don't quite understand why as the original
color temperature is lower.
Explanations, hints, RTFMs very welcome,
Karl.
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