Contrast ratio results for Dell/U2419H

Black
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)
Screen photo	[open image]
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	[open image]
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.