Contrast ratio results

Contrast ratio 1301:1
Monitor model
Submitted 19 Dec 2019 10:23 CET, by 94.54.*.*
Camera model Canon PowerShot A590 IS
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 1: suggested exposure time: 1.3 s (Set EV to +1.4)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.

Black
Screen photo
Luminance 0.22 cd/m2
Luminance spread 0.13 cd/m2 (2 standard deviations)
Exposure value –3.92 stops   (aim for –2 to –3)
Exposure spread 0.86 stops
Area used for calculation 0.455 x 0.607
Camera settings Exposure time: 0.5   ISO: 400   F-number: 2.8
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 288 cd/m2
Luminance spread 38 cd/m2 (2 standard deviations)
Exposure value –2.23 stops   (aim for –2 to –3)
Exposure spread 0.19 stops
Area used for calculation 0.455 x 0.607
Camera settings Exposure time: 1/807   ISO: 400   F-number: 2.8
Focal length: 34.3 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.