Contrast ratio results

Contrast ratio 699:1
Monitor model
Submitted 21 Apr 2022 03:51 CEST, by 176.72.*.*
Camera model samsung SM-G955F
Processing remarks

Note: image file 1: suggested exposure time: 0.7 s (Set EV to +1.2)
Warning: image file 2: Overexposed. Please decrease the shutter time.

Black
Screen photo
Luminance 0.16 cd/m2
Luminance spread 0.08 cd/m2 (2 standard deviations)
Exposure value –3.7 stops   (aim for –2 to –3)
Exposure spread 0.77 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 0.3   ISO: 400   F-number: 1.7
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 111 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –0 stops   (aim for –2 to –3)
Exposure spread 0 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 1/180   ISO: 400   F-number: 1.7
Focal length: 26 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.