Contrast ratio results for Dell p2417h

Black
Contrast ratio	1463:1
Monitor model	Dell p2417h
Submitted	20 Jul 2018 22:49 CEST, by 77.120..
Camera model	Canon EOS 40D
Processing remarks	Warning: image file 1: camera was zoomed in too much. Note: image file 1: suggested exposure time: 2.5 s (Set EV to -1.1) Warning: image file 2: camera was zoomed in too much.
Screen photo	[open image]
Luminance	0.03 cd/m2
Luminance spread	0.02 cd/m2 (2 standard deviations)
Exposure value	–1.44 stops (aim for –2 to –3)
Exposure spread	0.8 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 5.2 ISO: 400 F-number: 1.4 Focal length: 81 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	44 cd/m2
Luminance spread	17 cd/m2 (2 standard deviations)
Exposure value	–0.92 stops (aim for –2 to –3)
Exposure spread	0.57 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/197 ISO: 400 F-number: 1.4 Focal length: 81 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.