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

Contrast ratio results

Contrast ratio 657:1
Monitor model
Submitted 01 Jan 2022 15:12 CET, by 122.139.*.*
Camera model samsung SM-G9550
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 3: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 0.22 cd/m2
Luminance spread 0.09 cd/m2 (2 standard deviations)
Exposure value –1.52 stops   (aim for –2 to –3)
Exposure spread 0.63 stops
Area used for calculation 0.528 x 0.704
Camera settings Exposure time: 1   ISO: 400   F-number: 1.7
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 141 cd/m2
Luminance spread 34 cd/m2 (2 standard deviations)
Exposure value –1.13 stops   (aim for –2 to –3)
Exposure spread 0.34 stops
Area used for calculation 0.528 x 0.704
Camera settings Exposure time: 1/500   ISO: 400   F-number: 1.7
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 40 cd/m2
Luminance spread 15 cd/m2 (2 standard deviations)
Exposure value –2.95 stops   (aim for –2 to –3)
Exposure spread 0.56 stops
Area used for calculation 0.528 x 0.223
Camera settings Exposure time: 1/500   ISO: 400   F-number: 1.7
Focal length: 0 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.