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Contrast ratio results for NEC LCD22WV

Contrast ratio 264011:1
Monitor model NEC LCD22WV
Submitted 23 Apr 2015 15:44 CEST, by 80.55.*.*
Camera model Canon PowerShot SX230 HS
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 740.6 s (Set EV to +16.8)
Warning: image file 2: automatic white balance can cause inaccuracies.
Note: image file 2: suggested exposure time: 1/360 s (Set EV to -1.2)
Warning: image file 3: automatic white balance can cause inaccuracies.
image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –19.35 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.403 x 0.538
Camera settings Exposure time: 1/159   ISO: 800   F-number: 5
Focal length: 30.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 168 cd/m2
Luminance spread 56 cd/m2 (2 standard deviations)
Exposure value –1.33 stops   (aim for –2 to –3)
Exposure spread 0.48 stops
Area used for calculation 0.403 x 0.538
Camera settings Exposure time: 1/159   ISO: 800   F-number: 5
Focal length: 30.4 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 95 cd/m2
Luminance spread 193 cd/m2 (2 standard deviations)
Exposure value –2.17 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.403 x 0.538
Camera settings Exposure time: 1/159   ISO: 800   F-number: 5
Focal length: 30.4 mm   (35 mm equivalent)
Exposure compensation: 0

The luminance values in cd/m2 are not very reliable, since camera sensitivities can easily differ up to 50% from their nominal value. Typically, the real luminance is 30% lower than this number. The area used for calculation is chosen such that it corresponds to a viewing angle of ±14° horizontally and ±10.5° vertically, which is equivalent to viewing the screen from a distance of about 1.5 times the diagonal size.

Unfortunately, there is a lot of variation in how cameras use EXIF settings. If photos from your camera your produce unusable results, try coming back in a few days. I review submitted pictures regularly and try to fix problems.