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

Contrast ratio results

Contrast ratio 3368:1
Monitor model
Submitted 03 Mar 2022 19:58 CET, by 5.171.*.*
Camera model Xiaomi MI 9
Processing remarks

image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 9.7 s (Set EV to +7.3)
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.

Black
Screen photo
[open image]
Luminance 0.01 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –7.78 stops   (aim for –2 to –3)
Exposure spread 0.36 stops
Area used for calculation 0.345 x 0.458
Camera settings Exposure time: 1/4   ISO: 400   F-number: 1.7
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 2
White
Screen photo
[open image]
Luminance 38 cd/m2
Luminance spread 7 cd/m2 (2 standard deviations)
Exposure value –3.03 stops   (aim for –2 to –3)
Exposure spread 0.27 stops
Area used for calculation 0.342 x 0.472
Camera settings Exposure time: 1/500   ISO: 400   F-number: 1.7
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 2

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.