Contrast ratio | Test results | LCD test | Small-screen tests | Lagom home

Contrast ratio results for unknown

Contrast ratio 2:1
Monitor model unknown
Submitted 24 Aug 2018 23:48 CEST, by 5.172.*.*
Camera model HUAWEI PRA-LX1
Processing remarks

Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 2: Underexposed. Please increase the shutter time.

Black
Screen photo
[open image]
Luminance 6.31351e+07 cd/m2
Luminance spread 1.90305e+07 cd/m2 (2 standard deviations)
Exposure value –4.03 stops   (aim for –2 to –3)
Exposure spread 0.44 stops
Area used for calculation 0.345 x 0.459
Camera settings Exposure time: 1/99996336   ISO: 400   F-number: 2.2
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 1.10931e+08 cd/m2
Luminance spread 7.91282e+07 cd/m2 (2 standard deviations)
Exposure value –3.22 stops   (aim for –2 to –3)
Exposure spread 1.08 stops
Area used for calculation 0.345 x 0.459
Camera settings Exposure time: 1/99996336   ISO: 400   F-number: 2.2
Focal length: 26 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.