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

Contrast ratio results for Samsung

Contrast ratio 684:1
Monitor model Samsung
Submitted 15 Apr 2021 00:53 CEST, by 180.190.*.*
Camera model Xiaomi Redmi Note 9S
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 13.4 s (Set EV to -1.9)

Black
Screen photo
[open image]
Luminance 0.04 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –4.57 stops   (aim for –2 to –3)
Exposure spread 0.45 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 3.2   ISO: 100   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: -4
White
Screen photo
[open image]
Luminance 25 cd/m2
Luminance spread 4 cd/m2 (2 standard deviations)
Exposure value –3.15 stops   (aim for –2 to –3)
Exposure spread 0.2 stops
Area used for calculation 0.376 x 0.376
Camera settings Exposure time: 1/80   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.