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

Contrast ratio results

Contrast ratio 679:1
Monitor model
Submitted 14 Jul 2023 13:29 CEST, by 217.255.*.*
Camera model samsung SM-A528B
Processing remarks

Warning: image file 2: Overexposed. Please decrease the shutter time.

Black
Screen photo
[open image]
Luminance 0.35 cd/m2
Luminance spread 0.17 cd/m2 (2 standard deviations)
Exposure value –3 stops   (aim for –2 to –3)
Exposure spread 0.72 stops
Area used for calculation 0.361 x 0.361
Camera settings Exposure time: 1/4   ISO: 400   F-number: 1.8
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 236 cd/m2
Luminance spread 12 cd/m2 (2 standard deviations)
Exposure value –0.23 stops   (aim for –2 to –3)
Exposure spread 0.07 stops
Area used for calculation 0.361 x 0.361
Camera settings Exposure time: 1/400   ISO: 400   F-number: 1.8
Focal length: 25 mm   (35 mm equivalent)
Exposure compensation: 0
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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.