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

Contrast ratio results

Contrast ratio 4473:1
Monitor model
Submitted 15 Aug 2019 23:39 CEST, by 93.100.*.*
Camera model Xiaomi Mi-4c
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 12.8 s (Set EV to +4.7)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.02 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –7.17 stops   (aim for –2 to –3)
Exposure spread 1.45 stops
Area used for calculation 0.398 x 0.53
Camera settings Exposure time: 0.5   ISO: 200   F-number: 2
Focal length: 30 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 106 cd/m2
Luminance spread 13 cd/m2 (2 standard deviations)
Exposure value –1.01 stops   (aim for –2 to –3)
Exposure spread 0.18 stops
Area used for calculation 0.398 x 0.53
Camera settings Exposure time: 1/500   ISO: 800   F-number: 2
Focal length: 30 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.