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

Contrast ratio results

Contrast ratio 720:1 (edge: 1098:1)
Monitor model
Submitted 21 Oct 2020 02:27 CEST, by 93.35.*.*
Camera model Xiaomi MI 9
Processing remarks

Note: image file 3: suggested exposure time: 1.2 s (Set EV to +0.1)

Black
Screen photo
[open image]
Luminance 0.13 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –2.2 stops   (aim for –2 to –3)
Exposure spread 0.65 stops
Area used for calculation 0.345 x 0.46
Camera settings Exposure time: 1   ISO: 400   F-number: 1.7
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: -1.17
White
Screen photo
[open image]
Luminance 97 cd/m2
Luminance spread 15 cd/m2 (2 standard deviations)
Exposure value –1.67 stops   (aim for –2 to –3)
Exposure spread 0.23 stops
Area used for calculation 0.345 x 0.46
Camera settings Exposure time: 1/500   ISO: 400   F-number: 1.7
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: -1.17
Black at screen edge
Screen photo
[open image]
Luminance 0.09 cd/m2
Luminance spread 0.06 cd/m2 (2 standard deviations)
Exposure value –3.81 stops   (aim for –2 to –3)
Exposure spread 1.01 stops
Area used for calculation 0.345 x 0.46
Camera settings Exposure time: 0.5   ISO: 400   F-number: 1.7
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: -1.17

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.