Contrast ratio of Acer GN246HL

Contrast ratio 613:1
Monitor model Acer GN246HL
Submitted 30 Oct 2017 19:40 CET, by 184.66.*.*
Camera model Canon EOS REBEL T4i
Processing remarks


Black
Screen photo
Luminance 0.45 cd/m2
Luminance spread 0.48 cd/m2 (2 standard deviations)
Exposure value –2.54 stops   (aim for –2 to –3)
Exposure spread 1.73 stops
Area used for calculation 0.396 x 0.445
Camera settings Exposure time: 1   ISO: 400   F-number: 3.5
Focal length: 28.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 277 cd/m2
Luminance spread 172 cd/m2 (2 standard deviations)
Exposure value –1.9 stops   (aim for –2 to –3)
Exposure spread 0.93 stops
Area used for calculation 0.396 x 0.445
Camera settings Exposure time: 1/395   ISO: 400   F-number: 3.5
Focal length: 28.5 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.