Contrast ratio results for DELL U2417H

Contrast ratio 2171:1
Monitor model DELL U2417H
Submitted 02 Oct 2017 19:03 CEST, by 86.101.*.*
Camera model Canon EOS 400D DIGITAL
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 16.9 s (Set EV to +2.1)

Black
Screen photo
Luminance 0.07 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –4.58 stops   (aim for –2 to –3)
Exposure spread 0.17 stops
Area used for calculation 0.541 x 0.617
Camera settings Exposure time: 4   ISO: 200   F-number: 4
Focal length: 39.1 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 155 cd/m2
Luminance spread 9 cd/m2 (2 standard deviations)
Exposure value –2.46 stops   (aim for –2 to –3)
Exposure spread 0.09 stops
Area used for calculation 0.548 x 0.598
Camera settings Exposure time: 1/125   ISO: 200   F-number: 4
Focal length: 39.1 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.