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

Contrast ratio results

Contrast ratio 5657:1
Monitor model
Submitted 24 Jun 2021 21:21 CEST, by 5.38.*.*
Camera model Apple iPhone 8
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 0.9 s (Set EV to +1.5)
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/530 s (Set EV to -2.1)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.14 cd/m2
Luminance spread 0.11 cd/m2 (2 standard deviations)
Exposure value –4.02 stops   (aim for –2 to –3)
Exposure spread 1.2 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 0.3   ISO: 400   F-number: 1.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 804 cd/m2
Luminance spread 108 cd/m2 (2 standard deviations)
Exposure value –0.37 stops   (aim for –2 to –3)
Exposure spread 0.19 stops
Area used for calculation 0.404 x 0.404
Camera settings Exposure time: 1/120   ISO: 32   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.