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

Contrast ratio results

Contrast ratio 2424:1 (edge: 38795:1)
Monitor model
Submitted 30 May 2018 04:35 CEST, by 24.0.*.*
Camera model samsung SM-G955U
Processing remarks

image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 2: suggested exposure time: 1/90 s (Set EV to -1.6)
Warning: image file 3: camera was zoomed in too much.
image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 215.6 s (Set EV to +5.8)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.02 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –1.93 stops   (aim for –2 to –3)
Exposure spread 0.83 stops
Area used for calculation 0.352 x 0.433
Camera settings Exposure time: 10   ISO: 400   F-number: 1.7
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 39 cd/m2
Luminance spread 9 cd/m2 (2 standard deviations)
Exposure value –0.92 stops   (aim for –2 to –3)
Exposure spread 0.32 stops
Area used for calculation 0.356 x 0.419
Camera settings Exposure time: 1/30   ISO: 100   F-number: 1.7
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –8.25 stops   (aim for –2 to –3)
Exposure spread 0.58 stops
Area used for calculation 1 x 0.206
Camera settings Exposure time: 4   ISO: 200   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.