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

Contrast ratio results for 248e9qhsb

Contrast ratio 2738:1 (edge: 24265:1)
Monitor model 248e9qhsb
Submitted 15 Feb 2020 03:34 CET, by 45.63.*.*
Camera model HUAWEI HLK-AL00
Processing remarks

Warning: image file 1: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 1: Underexposed. Please increase the shutter time.
Warning: image file 2: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 3: exposure time below 1/500 sec is unreliable. Try increasing the EV compensation.
Warning: image file 3: Underexposed. Please increase the shutter time.

Black
Screen photo
[open image]
Luminance 71736 cd/m2
Luminance spread 220548 cd/m2 (2 standard deviations)
Exposure value –13.24 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.331 x 0.539
Camera settings Exposure time: 1/99996336   ISO: 400   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 1.96434e+08 cd/m2
Luminance spread 6.59497e+07 cd/m2 (2 standard deviations)
Exposure value –1.82 stops   (aim for –2 to –3)
Exposure spread 0.49 stops
Area used for calculation 0.331 x 0.539
Camera settings Exposure time: 1/99996336   ISO: 400   F-number: 1.8
Focal length: 26 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 8095 cd/m2
Luminance spread 4237 cd/m2 (2 standard deviations)
Exposure value –16.38 stops   (aim for –2 to –3)
Exposure spread 0.77 stops
Area used for calculation 0.719 x 0.248
Camera settings Exposure time: 1/99996336   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.