Contrast ratio results

Contrast ratio 1:1
Monitor model
Submitted 25 Nov 2021 14:15 CET, by 198.53.*.*
Camera model GENERAL IMAGING CO. X500
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: 111.7 s (Set EV to +7.8)
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 122.8 s (Set EV to +7.9)

Black
Screen photo
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –10.44 stops   (aim for –2 to –3)
Exposure spread 1.56 stops
Area used for calculation 0.129 x 0.171
Camera settings Exposure time: 0.5   ISO: 400   F-number: 2.9
Focal length: 9.7 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –10.3 stops   (aim for –2 to –3)
Exposure spread 1.24 stops
Area used for calculation 0.129 x 0.171
Camera settings Exposure time: 0.5   ISO: 400   F-number: 2.9
Focal length: 9.7 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.