Contrast ratio results for gn246hl

Contrast ratio 534:1
Monitor model gn246hl
Submitted 01 Feb 2017 04:30 CET, by 75.139.*.*
Camera model SAMSUNG SGH-T399N
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 0.5 s (Set EV to +4.1)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: Image ISO settings are not the same.

Black
Screen photo
Luminance 0.49 cd/m2
Luminance spread 0.82 cd/m2 (2 standard deviations)
Exposure value –6.61 stops   (aim for –2 to –3)
Exposure spread 3.51 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/33   ISO: 400   F-number: 2.6
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 260 cd/m2
Luminance spread 84 cd/m2 (2 standard deviations)
Exposure value –1.62 stops   (aim for –2 to –3)
Exposure spread 0.47 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/138   ISO: 100   F-number: 2.6
Focal length: 0 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.