Contrast ratio results for HP 24f

Contrast ratio 18862:1
Monitor model HP 24f
Submitted 03 Jan 2019 17:54 CET, by 95.91.*.*
Camera model Xiaomi Redmi Note 5
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 19.8 s (Set EV to +8.0)

Black
Screen photo
Luminance 0.01 cd/m2
Luminance spread 0.01 cd/m2 (2 standard deviations)
Exposure value –10.51 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.323 x 0.404
Camera settings Exposure time: 1/13   ISO: 400   F-number: 1.9
Focal length: 24 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 130 cd/m2
Luminance spread 16 cd/m2 (2 standard deviations)
Exposure value –1.2 stops   (aim for –2 to –3)
Exposure spread 0.18 stops
Area used for calculation 0.323 x 0.404
Camera settings Exposure time: 1/387   ISO: 400   F-number: 1.9
Focal length: 24 mm   (35 mm equivalent)
Exposure compensation: 0
{adcode}

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.