Contrast ratio results for Dell/U2419H

Contrast ratio 1274:1
Monitor model Dell/U2419H
Submitted 26 Mar 2020 02:23 CET, by 73.189.*.*
Camera model Nikon D40
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 5.7 s (Set EV to -0.3)
Note: image file 2: suggested exposure time: 1/220 s (Set EV to -0.8)

Black
Screen photo
Luminance 0.08 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –4.16 stops   (aim for –2 to –3)
Exposure spread 1.2 stops
Area used for calculation 0.375 x 0.423
Camera settings Exposure time: 1.8   ISO: 400   F-number: 3.5
Focal length: 27 mm   (35 mm equivalent)
Exposure compensation: -2
White
Screen photo
Luminance 104 cd/m2
Luminance spread 21 cd/m2 (2 standard deviations)
Exposure value –3.66 stops   (aim for –2 to –3)
Exposure spread 0.3 stops
Area used for calculation 0.375 x 0.423
Camera settings Exposure time: 1/500   ISO: 400   F-number: 3.5
Focal length: 27 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.