Contrast ratio results for xg2401

Contrast ratio 1030:1
Monitor model xg2401
Submitted 20 Nov 2019 20:29 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.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 3.5 s (Set EV to +1.8)

Black
Screen photo
Luminance 0.13 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –4.29 stops   (aim for –2 to –3)
Exposure spread 0.55 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1   ISO: 400   F-number: 3.5
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 137 cd/m2
Luminance spread 18 cd/m2 (2 standard deviations)
Exposure value –2.26 stops   (aim for –2 to –3)
Exposure spread 0.19 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1/251   ISO: 400   F-number: 3.5
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.