Contrast ratio of Dell U2717D

Black
Contrast ratio	1278:1 (edge: 1672:1)
Monitor model	Dell U2717D
Submitted	30 May 2017 22:19 CEST, by 46.29..
Camera model	Canon PowerShot SX260 HS
Processing remarks	Note: image file 3: suggested exposure time: 2.3 s (Set EV to +1.2)
Screen photo	[open image]
Luminance	0.27 cd/m2
Luminance spread	0.15 cd/m2 (2 standard deviations)
Exposure value	–3.3 stops (aim for –2 to –3)
Exposure spread	0.81 stops
Area used for calculation	0.363 x 0.363
Camera settings	Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 25.1 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	341 cd/m2
Luminance spread	15 cd/m2 (2 standard deviations)
Exposure value	–1.63 stops (aim for –2 to –3)
Exposure spread	0.06 stops
Area used for calculation	0.363 x 0.363
Camera settings	Exposure time: 1/403 ISO: 400 F-number: 3.5 Focal length: 25.1 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.2 cd/m2
Luminance spread	0.12 cd/m2 (2 standard deviations)
Exposure value	–3.68 stops (aim for –2 to –3)
Exposure spread	0.85 stops
Area used for calculation	0.363 x 0.363
Camera settings	Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 25.1 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.