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

Contrast ratio results

Contrast ratio 474:1
Monitor model
Submitted 14 Apr 2021 05:18 CEST, by 180.190.*.*
Camera model Xiaomi Redmi Note 9S
Processing remarks

Note: image file 1: suggested exposure time: 0.3 s (Set EV to +0.3)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.06 cd/m2
Luminance spread 0.03 cd/m2 (2 standard deviations)
Exposure value –3.93 stops   (aim for –2 to –3)
Exposure spread 0.69 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 1/8   ISO: 2550   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: -1.17
White
Screen photo
[open image]
Luminance 27 cd/m2
Luminance spread 5 cd/m2 (2 standard deviations)
Exposure value –2.62 stops   (aim for –2 to –3)
Exposure spread 0.28 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 1/60   ISO: 100   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: -4

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.