Contrast ratio of Dell U2717D

Black
Contrast ratio	1273:1 (edge: 1385:1)
Monitor model	Dell U2717D
Submitted	30 May 2017 22:38 CEST, by 46.29..
Camera model	Canon PowerShot SX260 HS
Processing remarks	Note: image file 3: suggested exposure time: 1.9 s (Set EV to +1.3)
Screen photo	[open image]
Luminance	0.26 cd/m2
Luminance spread	0.14 cd/m2 (2 standard deviations)
Exposure value	–3.33 stops (aim for –2 to –3)
Exposure spread	0.8 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	331 cd/m2
Luminance spread	18 cd/m2 (2 standard deviations)
Exposure value	–1.67 stops (aim for –2 to –3)
Exposure spread	0.08 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	0.24 cd/m2
Luminance spread	0.22 cd/m2 (2 standard deviations)
Exposure value	–3.78 stops (aim for –2 to –3)
Exposure spread	1.43 stops
Area used for calculation	0.363 x 0.363
Camera settings	Exposure time: 0.8 ISO: 400 F-number: 3.5 Focal length: 25.1 mm (35 mm equivalent) Exposure compensation: 0

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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.