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

Contrast ratio results

Contrast ratio 18:1
Monitor model
Submitted 18 Sep 2020 12:59 CEST, by 136.52.*.*
Camera model samsung SM-G960U
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 0.8 s (Set EV to +1.6)
image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 0.11 cd/m2
Luminance spread 0.05 cd/m2 (2 standard deviations)
Exposure value –4.13 stops   (aim for –2 to –3)
Exposure spread 0.64 stops
Area used for calculation 0.345 x 0.46
Camera settings Exposure time: 1/4   ISO: 400   F-number: 1.5
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 2.02 cd/m2
Luminance spread 2.26 cd/m2 (2 standard deviations)
Exposure value –2.45 stops   (aim for –2 to –3)
Exposure spread 1.82 stops
Area used for calculation 0.345 x 0.46
Camera settings Exposure time: 1/23   ISO: 400   F-number: 1.5
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 9 cd/m2
Luminance spread 18 cd/m2 (2 standard deviations)
Exposure value –2.22 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.345 x 0.46
Camera settings Exposure time: 1/91   ISO: 400   F-number: 1.5
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.