Contrast ratio results for acer xb241H

Black
Contrast ratio	45:1
Monitor model	acer xb241H
Submitted	11 Feb 2017 21:59 CET, by 86.179..
Camera model	Nikon D3100
Processing remarks	image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 2: Overexposed. Please decrease the shutter time. Note: image file 2: suggested exposure time: 1/28 s (Set EV to -2.5)
Screen photo	[open image]
Luminance	0.29 cd/m2
Luminance spread	0.23 cd/m2 (2 standard deviations)
Exposure value	–2.16 stops (aim for –2 to –3)
Exposure spread	1.21 stops
Area used for calculation	0.375 x 0.422
Camera settings	Exposure time: 2 ISO: 400 F-number: 3.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	13 cd/m2
Luminance spread	0 cd/m2 (2 standard deviations)
Exposure value	–-0 stops (aim for –2 to –3)
Exposure spread	0 stops
Area used for calculation	0.375 x 0.422
Camera settings	Exposure time: 1/5 ISO: 400 F-number: 3.5 Focal length: 27 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.