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

Contrast ratio results for xg2401

Contrast ratio 4729:1
Monitor model xg2401
Submitted 02 Sep 2021 20:26 CEST, by 99.238.*.*
Camera model Apple iPhone XR
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 4.2 s (Set EV to +2.1)

Black
Screen photo
[open image]
Luminance 0.03 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –4.57 stops   (aim for –2 to –3)
Exposure spread 1.16 stops
Area used for calculation 0.425 x 0.319
Camera settings Exposure time: 1   ISO: 400   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 138 cd/m2
Luminance spread 5 cd/m2 (2 standard deviations)
Exposure value –0.82 stops   (aim for –2 to –3)
Exposure spread 0.05 stops
Area used for calculation 0.425 x 0.319
Camera settings Exposure time: 1/350   ISO: 400   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.