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

Contrast ratio of HP 27 all-in-one

Contrast ratio 654:1
Monitor model HP 27 all-in-one
Submitted 28 Feb 2019 05:21 CET, by 67.168.*.*
Camera model Sony ILCE-7M3
Processing remarks

Note: image file 1: suggested exposure time: 0.4 s (Set EV to -1.3)

Black
Screen photo
[open image]
Luminance 0.29 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –1.24 stops   (aim for –2 to –3)
Exposure spread 0.34 stops
Area used for calculation 0.695 x 0.78
Camera settings Exposure time: 1   ISO: 400   F-number: 1.8
Focal length: 50 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 192 cd/m2
Luminance spread 31 cd/m2 (2 standard deviations)
Exposure value –0.53 stops   (aim for –2 to –3)
Exposure spread 0.23 stops
Area used for calculation 0.695 x 0.78
Camera settings Exposure time: 1/400   ISO: 400   F-number: 1.8
Focal length: 50 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.