Contrast ratio results for Acer XB240h

Black
Contrast ratio	2114:1
Monitor model	Acer XB240h
Submitted	27 Oct 2016 20:15 CEST, by 81.167..
Camera model	samsung SM-G930F
Processing remarks	Warning: image file 1: automatic white balance can cause inaccuracies. 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: 3.5 s (Set EV to +4.4) Warning: image file 2: automatic white balance can cause inaccuracies. image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Note: image file 2: suggested exposure time: 1/120 s (Set EV to -0.5) Warning: Image ISO settings are not the same.
Screen photo	[open image]
Luminance	0.06 cd/m2
Luminance spread	0.72 cd/m2 (2 standard deviations)
Exposure value	–8.91 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.345 x 0.46
Camera settings	Exposure time: 1/24 ISO: 200 F-number: 1.7 Focal length: 26 mm (35 mm equivalent) Exposure compensation: -2
White
Screen photo	[open image]
Luminance	131 cd/m2
Luminance spread	99 cd/m2 (2 standard deviations)
Exposure value	–4.01 stops (aim for –2 to –3)
Exposure spread	1.15 stops
Area used for calculation	0.345 x 0.46
Camera settings	Exposure time: 1/340 ISO: 40 F-number: 1.7 Focal length: 26 mm (35 mm equivalent) Exposure compensation: -2

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.