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

Contrast ratio results

Contrast ratio 2000:1
Monitor model
Submitted 11 Feb 2020 19:38 CET, by 42.153.*.*
Camera model Xiaomi POCOPHONE F1
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Note: image file 1: suggested exposure time: 1/7 s (Set EV to +1.2)
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.04 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –3.7 stops   (aim for –2 to –3)
Exposure spread 0.15 stops
Area used for calculation 0.289 x 0.289
Camera settings Exposure time: 1/17   ISO: 9600   F-number: 1.9
Focal length: 20 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 84 cd/m2
Luminance spread 4 cd/m2 (2 standard deviations)
Exposure value –2.19 stops   (aim for –2 to –3)
Exposure spread 0.07 stops
Area used for calculation 0.289 x 0.289
Camera settings Exposure time: 1/125   ISO: 100   F-number: 1.9
Focal length: 20 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.