Contrast ratio results

Contrast ratio 1966:1
Monitor model
Submitted 14 Dec 2019 23:04 CET, by 146.212.*.*
Camera model Canon PowerShot SX40 HS
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1.7 s (Set EV to +1.1)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
Luminance 0.16 cd/m2
Luminance spread 0.12 cd/m2 (2 standard deviations)
Exposure value –4.6 stops   (aim for –2 to –3)
Exposure spread 1.09 stops
Area used for calculation 0.347 x 0.463
Camera settings Exposure time: 0.4   ISO: 400   F-number: 2.7
Focal length: 26.2 mm   (35 mm equivalent)
Exposure compensation: -1
White
Screen photo
Luminance 315 cd/m2
Luminance spread 37 cd/m2 (2 standard deviations)
Exposure value –3 stops   (aim for –2 to –3)
Exposure spread 0.17 stops
Area used for calculation 0.347 x 0.463
Camera settings Exposure time: 1/1614   ISO: 400   F-number: 2.7
Focal length: 26.2 mm   (35 mm equivalent)
Exposure compensation: -2

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.