Contrast ratio results

Contrast ratio 4729:1
Monitor model
Submitted 12 Aug 2018 12:32 CEST, by 84.117.*.*
Camera model Canon PowerShot S100
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 3.4 s (Set EV to +2.1)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
Luminance 0.04 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –4.58 stops   (aim for –2 to –3)
Exposure spread 0.87 stops
Area used for calculation 0.349 x 0.465
Camera settings Exposure time: 0.8   ISO: 400   F-number: 2
Focal length: 26.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 211 cd/m2
Luminance spread 53 cd/m2 (2 standard deviations)
Exposure value –1.71 stops   (aim for –2 to –3)
Exposure spread 0.36 stops
Area used for calculation 0.349 x 0.465
Camera settings Exposure time: 1/807   ISO: 400   F-number: 2
Focal length: 26.3 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.