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

Contrast ratio of HP 23xi (Brightness 30, Contrast 80)

Contrast ratio 894:1
Monitor model HP 23xi (Brightness 30, Contrast 80)
Submitted 27 Dec 2014 21:25 CET, by 178.143.*.*
Camera model Canon EOS 350D DIGITAL
Processing remarks


Black
Screen photo
[open image]
Luminance 0.12 cd/m2
Luminance spread 0.07 cd/m2 (2 standard deviations)
Exposure value –2.15 stops   (aim for –2 to –3)
Exposure spread 0.9 stops
Area used for calculation 0.521 x 0.586
Camera settings Exposure time: 13   ISO: 400   F-number: 5.6
Focal length: 37.5 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 104 cd/m2
Luminance spread 22 cd/m2 (2 standard deviations)
Exposure value –1.95 stops   (aim for –2 to –3)
Exposure spread 0.31 stops
Area used for calculation 0.521 x 0.586
Camera settings Exposure time: 1/60   ISO: 400   F-number: 5.6
Focal length: 37.5 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.