Contrast ratio results for LG

Contrast ratio 9:1
Monitor model LG
Submitted 26 Sep 2018 00:41 CEST, by 1.4.*.*
Camera model Canon EOS 5D Mark III
Processing remarks

Warning: using the flash makes no sense.
Warning: image file 1: camera was zoomed in too much.
Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: using the flash makes no sense.
Warning: image file 2: camera was zoomed in too much.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Warning: using the flash makes no sense.
Warning: image file 3: camera was zoomed in too much.
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 ISO settings are not the same.
Warning: Image F-number settings are not the same.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
Luminance 2103 cd/m2
Luminance spread 6712 cd/m2 (2 standard deviations)
Exposure value –3.05 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 0.5
Camera settings Exposure time: 1/128   ISO: 320   F-number: 22.6
Focal length: 259 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 18300 cd/m2
Luminance spread 19335 cd/m2 (2 standard deviations)
Exposure value –0.58 stops   (aim for –2 to –3)
Exposure spread 1.7 stops
Area used for calculation 1 x 0.75
Camera settings Exposure time: 1/200   ISO: 250   F-number: 20
Focal length: 227 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 2103 cd/m2
Luminance spread 6712 cd/m2 (2 standard deviations)
Exposure value –3.05 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 0.5
Camera settings Exposure time: 1/128   ISO: 320   F-number: 22.6
Focal length: 259 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.