Contrast ratio results

Contrast ratio 1484:1 (edge: 869:1)
Monitor model
Submitted 04 Jul 2020 08:08 CEST, by 207.237.*.*
Camera model Canon EOS 60D
Processing remarks

image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 5.3 s (Set EV to +2.4)
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 3.1 s (Set EV to +1.6)

Black
Screen photo
Luminance 0.09 cd/m2
Luminance spread 0.1 cd/m2 (2 standard deviations)
Exposure value –4.9 stops   (aim for –2 to –3)
Exposure spread 1.77 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 1   ISO: 400   F-number: 3.5
Focal length: 28.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 130 cd/m2
Luminance spread 23 cd/m2 (2 standard deviations)
Exposure value –2.99 stops   (aim for –2 to –3)
Exposure spread 0.26 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 1/395   ISO: 400   F-number: 3.5
Focal length: 28.3 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
Luminance 0.15 cd/m2
Luminance spread 0.25 cd/m2 (2 standard deviations)
Exposure value –4.13 stops   (aim for –2 to –3)
Exposure spread 3.36 stops
Area used for calculation 0.393 x 0.442
Camera settings Exposure time: 1   ISO: 400   F-number: 3.5
Focal length: 28.3 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.