DisplayCAL scale brightness

[bilanciamist]

Hi,

I’d like to calibrate the  display of my Sony Vaio notebook with a Datacolor Spyder 3.
(Windows 10 – GeForce Go 330m – i7-740q – 1920×1080 – no rgb controls, just Windows screen brightness set to 100%)

Used settings:

Spyder3 (with ArgyllCMS Drivers)
LCD (generic)
White e Black level drift compensation
Output levels: Auto
Correction: Auto (None)
6500°K
120.00 or 140.00 cd/m2
Black level: As measured
Gamma 2.2
Calibration Speed: medium or low
Profile type:  XYZ LUT + matriz
Profile quality: medium or high
Testchart: Auto-Optimized 425 or 833 patches
Patch sequence: Minimize display response delay

But the resulting Luminance doesn’t match the target (max 95-96 cd/m2). The uncalibred white level is about 147 cd/m^2.

In the log Displaycal write:
Had to scale brightness from 140.000000 to 96.523598 to fit within gamut, corresponding to aprox. RGB 0.812022 0.780340 1.000000

Is there a system to avoid this?

Enclosed is one of the measurement reports.

Thanks

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[Florian Höch]

Is there a system to avoid this?

Yes, by using the native white (“as measured”) of your notebook.

[bilanciamist]

Tankyou Florian,

Using the native white is the only way?

The native white is about 4800-5000°K  (report on uncalibrated display device), too warm for me.

[Florian Höch]

Using the native white is the only way?

If you want maximum contrast (which seems likely, as the display already seems to be severely limited in that regard), then yes.

[bilanciamist]

Ok, this is the log of a complete calibration and its measurement report, if you want to check it out.

in orange (8 Warnings):
Warning: Skipping RGB 1.96 1.96 1.96 XYZ 2.286474 2.437223 2.233692 because ↲
↳ Y is not monotonically increasing

in red:
Brightness error = -0.266983 cd/m^2 (is 95.953157, should be 96.220140)
White point error = 0.359201 deltaE
Maximum neutral error (@ 0.036503) = 0.421062 deltaE
Average neutral error = 0.225407 deltaE

Profile check complete, errors: max. = 2.623368, avg. = 0.292953, RMS = 0.516861

in the report – extended verification testchart (RGB + gray balance):
RGB gray balance (>= 1% luminance) combined Δa*00 and Δb*00 range 2.36 NOT OK

thanks again

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[bilanciamist]

Hi,

I’d like to calibrate an external LG monitor as well, but i can’t set FullRGB output in HDMI \ Nvidia settings. (not even using CRU-Custom Resolution Utility).

in the log:
Detected limited range output levels
Using TV encoding range of (16-235)/255

but i can use Ycbcr444 output

Which one is better?

Limited RGB output with limited RGB monitor or Ycbcr444 output with fullRGB monitor?

(The monitor can be set in both ways)

Thanks

[Florian Höch]

Ycbcr444 output with fullRGB monitor?

YCbCr is always limited range.

[bilanciamist]

Thanks for the reply.

After many tests i can get FullRGB on the LG monitor (with HDMI cable) only if i turn on LG “smart energy saving”.

RGB level 0 is 0.267215 cd/m2
RGB level 16 is 0.506990 cd/m2
Assuming full range output levels

Maybe is a false positive. I  try to calibrate the monitor with this option on.

[bilanciamist]

here is the report of the LG monitor calibration.

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