Contrast ratio results

Black
Contrast ratio	1.01371e+06:1 (edge: 778331:1)
Monitor model
Submitted	28 Sep 2016 18:30 CEST, by 85.23..
Camera model	Nikon D750
Processing remarks	image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 33.8 s (Set EV to +2.5) image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 3: Underexposed. Please increase the shutter time. Note: image file 3: suggested exposure time: 26.0 s (Set EV to +2.1) Warning: Image ISO settings are not the same. Warning: Image F-number settings are not the same. Warning: Image focal lengths/zoom levels are not the same.
Screen photo	[open image]
Luminance	0 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–4.99 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.207 x 0.308
Camera settings	Exposure time: 6 ISO: 1600 F-number: 4 Focal length: 16 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	4534 cd/m2
Luminance spread	6582 cd/m2 (2 standard deviations)
Exposure value	–1.58 stops (aim for –2 to –3)
Exposure spread	2.65 stops
Area used for calculation	0.333 x 0.375
Camera settings	Exposure time: 1/400 ISO: 100 F-number: 6.3 Focal length: 24 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	0.01 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–4.61 stops (aim for –2 to –3)
Exposure spread	3.42 stops
Area used for calculation	0.217 x 0.264
Camera settings	Exposure time: 6 ISO: 1600 F-number: 4 Focal length: 16 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.