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

Contrast ratio results for HP Z Display

Contrast ratio 1100:1
Monitor model HP Z Display
Submitted 01 Jan 2019 01:52 CET, by 84.1.*.*
Camera model Canon DIGITAL IXUS 870 IS
Processing remarks

Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 3.5 s (Set EV to -0.9)
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/310 s (Set EV to +2.0)

Black
Screen photo
[open image]
Luminance 0.17 cd/m2
Luminance spread 0.11 cd/m2 (2 standard deviations)
Exposure value –5.63 stops   (aim for –2 to –3)
Exposure spread 1.02 stops
Area used for calculation 0.399 x 0.399
Camera settings Exposure time: 0.4   ISO: 200   F-number: 2.8
Focal length: 27.6 mm   (35 mm equivalent)
Exposure compensation: -4
White
Screen photo
[open image]
Luminance 186 cd/m2
Luminance spread 11 cd/m2 (2 standard deviations)
Exposure value –0.51 stops   (aim for –2 to –3)
Exposure spread 0.09 stops
Area used for calculation 0.399 x 0.399
Camera settings Exposure time: 1/79   ISO: 200   F-number: 2.8
Focal length: 27.6 mm   (35 mm equivalent)
Exposure compensation: 4

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.