Contrast ratio results for Acer

Contrast ratio 450:1
Monitor model Acer
Submitted 06 Dec 2014 06:28 CET, by 114.78.*.*
Camera model Olympus E-PM2
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 0.4 s (Set EV to +1.5)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
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.

Black
Screen photo
Luminance 0.16 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –4.05 stops   (aim for –2 to –3)
Exposure spread 0.53 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/8   ISO: 3200   F-number: 3.5
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 71 cd/m2
Luminance spread 32 cd/m2 (2 standard deviations)
Exposure value –2.2 stops   (aim for –2 to –3)
Exposure spread 0.65 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/1000   ISO: 3200   F-number: 3.5
Focal length: 28 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.