Contrast ratio results for XB271HU

Black
Contrast ratio	575992:1 (edge: 32775:1)
Monitor model	XB271HU
Submitted	25 Oct 2016 19:32 CEST, by 83.34..
Camera model	LGE Nexus 5
Processing remarks	Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 25903.7 s (Set EV to +16.7) Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 2: automatic white balance can cause inaccuracies. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/22 s (Set EV to -2.5) Warning: image file 3: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 3: automatic white balance can cause inaccuracies. Warning: image file 3: Underexposed. Please increase the shutter time. Note: image file 3: suggested exposure time: 1474.0 s (Set EV to +12.5)
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–19.16 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/4 ISO: 100 F-number: 2.4 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	19 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–0.02 stops (aim for –2 to –3)
Exposure spread	-0 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/4 ISO: 100 F-number: 2.4 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–15.03 stops (aim for –2 to –3)
Exposure spread	1.3 stops
Area used for calculation	0.528 x 0.528
Camera settings	Exposure time: 1/4 ISO: 100 F-number: 2.4 Focal length: 0 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.