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

Contrast ratio results for Samsung S31C

Contrast ratio 62:1 (edge: 50:1)
Monitor model Samsung S31C
Submitted 10 Jul 2024 00:14 CEST, by 90.64.*.*
Camera model Xiaomi M2003J15SC
Processing remarks

Note: image file 1: suggested exposure time: 2.7 s (Set EV to +1.5)
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/23 s (Set EV to -2.5)
Note: image file 3: suggested exposure time: 2.2 s (Set EV to +1.1)

Black
Screen photo
[open image]
Luminance 0.04 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –3.95 stops   (aim for –2 to –3)
Exposure spread 1.27 stops
Area used for calculation 0.404 x 0.405
Camera settings Exposure time: 1   ISO: 400   F-number: 1.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 2.77 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –0 stops   (aim for –2 to –3)
Exposure spread 0 stops
Area used for calculation 0.404 x 0.405
Camera settings Exposure time: 1/4   ISO: 400   F-number: 1.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0.06 cd/m2
Luminance spread 0.04 cd/m2 (2 standard deviations)
Exposure value –3.64 stops   (aim for –2 to –3)
Exposure spread 1.09 stops
Area used for calculation 0.404 x 0.405
Camera settings Exposure time: 1   ISO: 400   F-number: 1.8
Focal length: 28 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.