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

Contrast ratio results

Contrast ratio 1032:1
Monitor model
Submitted 24 Dec 2017 19:14 CET, by 124.6.*.*
Camera model Walton Primo RX3
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
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: 0.6 s (Set EV to +2.0)
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
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: 1/120 s (Set EV to -1.8)
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 0.08 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –4.51 stops   (aim for –2 to –3)
Exposure spread 0.34 stops
Area used for calculation 0.528 x 0.223
Camera settings Exposure time: 1/7   ISO: 1950   F-number: 2.4
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 80 cd/m2
Luminance spread 8 cd/m2 (2 standard deviations)
Exposure value –0.67 stops   (aim for –2 to –3)
Exposure spread 0.14 stops
Area used for calculation 0.528 x 0.223
Camera settings Exposure time: 1/33   ISO: 127   F-number: 2.4
Focal length: 0 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.