Contrast ratio results

Black
Contrast ratio	57:1 (edge: 30:1)
Monitor model
Submitted	06 Sep 2018 23:16 CEST, by 140.0..
Camera model	samsung SM-N910H
Processing remarks	Warning: image file 3: automatic white balance can cause inaccuracies. Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	1.84 cd/m2
Luminance spread	3.21 cd/m2 (2 standard deviations)
Exposure value	–3.25 stops (aim for –2 to –3)
Exposure spread	3.87 stops
Area used for calculation	0.411 x 0.548
Camera settings	Exposure time: 1/17 ISO: 400 F-number: 2.2 Focal length: 31 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	106 cd/m2
Luminance spread	17 cd/m2 (2 standard deviations)
Exposure value	–1.86 stops (aim for –2 to –3)
Exposure spread	0.24 stops
Area used for calculation	0.411 x 0.548
Camera settings	Exposure time: 1/370 ISO: 400 F-number: 2.2 Focal length: 31 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	3.52 cd/m2
Luminance spread	7.49 cd/m2 (2 standard deviations)
Exposure value	–2.2 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.411 x 0.548
Camera settings	Exposure time: 1/25 ISO: 640 F-number: 2.2 Focal length: 31 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.