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

Contrast ratio results

Contrast ratio 471:1
Monitor model
Submitted 24 May 2020 01:49 CEST, by 24.16.*.*
Camera model Apple iPhone 11 Pro
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1/10 s (Set EV to +1.6)
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Note: image file 2: suggested exposure time: 1/470 s (Set EV to -2.0)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.77 cd/m2
Luminance spread 0.19 cd/m2 (2 standard deviations)
Exposure value –4.08 stops   (aim for –2 to –3)
Exposure spread 0.35 stops
Area used for calculation 0.372 x 0.382
Camera settings Exposure time: 1/30   ISO: 640   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 361 cd/m2
Luminance spread 29 cd/m2 (2 standard deviations)
Exposure value –0.55 stops   (aim for –2 to –3)
Exposure spread 0.12 stops
Area used for calculation 0.39 x 0.353
Camera settings Exposure time: 1/122   ISO: 64   F-number: 1.8
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.