Contrast ratio results

Contrast ratio 117:1
Monitor model
Submitted 09 Apr 2021 15:40 CEST, by 121.200.*.*
Camera model Sony ILCE-7RM2
Processing remarks

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: 0.9 s (Set EV to +5.3)
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 2: suggested exposure time: 1/130 s (Set EV to -1.5)

Black
Screen photo
Luminance 0.68 cd/m2
Luminance spread 0.73 cd/m2 (2 standard deviations)
Exposure value –7.82 stops   (aim for –2 to –3)
Exposure spread 1.71 stops
Area used for calculation 0.729 x 0.973
Camera settings Exposure time: 1/45   ISO: 400   F-number: 4
Focal length: 55 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 80 cd/m2
Luminance spread 27 cd/m2 (2 standard deviations)
Exposure value –0.95 stops   (aim for –2 to –3)
Exposure spread 0.49 stops
Area used for calculation 0.729 x 0.973
Camera settings Exposure time: 1/45   ISO: 400   F-number: 4
Focal length: 55 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.