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

Contrast ratio results

Contrast ratio 1635:1
Monitor model
Submitted 01 Sep 2020 19:45 CEST, by 202.8.*.*
Camera model Xiaomi Redmi K20 Pro
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 1: suggested exposure time: 1/6 s (Set EV to +1.1)
Warning: image file 2: automatic white balance can cause inaccuracies.
Note: image file 2: suggested exposure time: 1/280 s (Set EV to -1.5)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.04 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –3.64 stops   (aim for –2 to –3)
Exposure spread 0.46 stops
Area used for calculation 0.347 x 0.451
Camera settings Exposure time: 1/14   ISO: 7470   F-number: 1.7
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 61 cd/m2
Luminance spread 5 cd/m2 (2 standard deviations)
Exposure value –1.03 stops   (aim for –2 to –3)
Exposure spread 0.12 stops
Area used for calculation 0.345 x 0.459
Camera settings Exposure time: 1/100   ISO: 199   F-number: 1.7
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.