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

Contrast ratio results

Contrast ratio 6883:1
Monitor model
Submitted 03 Jan 2021 07:23 CET, by 176.67.*.*
Camera model Apple iPhone 7
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 9.3 s (Set EV to +2.9)
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/180 s (Set EV to +0.3)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.07 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –8.04 stops   (aim for –2 to –3)
Exposure spread 0.32 stops
Area used for calculation 0.458 x 0.343
Camera settings Exposure time: 1/5   ISO: 80   F-number: 1.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: -2.61
White
Screen photo
[open image]
Luminance 452 cd/m2
Luminance spread 38 cd/m2 (2 standard deviations)
Exposure value –5.41 stops   (aim for –2 to –3)
Exposure spread 0.12 stops
Area used for calculation 0.458 x 0.343
Camera settings Exposure time: 1/1389   ISO: 20   F-number: 1.8
Focal length: 28 mm   (35 mm equivalent)
Exposure compensation: -2.61

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.