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

Contrast ratio results for HP

Contrast ratio 76:1
Monitor model HP
Submitted 05 Jan 2015 14:44 CET, by 203.176.*.*
Camera model LG Electronics LG-D620R
Processing remarks

Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Overexposed. Please decrease the shutter time.
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: image file 3: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
Warning: Image ISO settings are not the same.
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 1.03 cd/m2
Luminance spread 2.19 cd/m2 (2 standard deviations)
Exposure value –1.52 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.528 x 0.704
Camera settings Exposure time: 1/9   ISO: 1500   F-number: 2.4
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 79 cd/m2
Luminance spread 31 cd/m2 (2 standard deviations)
Exposure value –1.91 stops   (aim for –2 to –3)
Exposure spread 0.57 stops
Area used for calculation 0.528 x 0.704
Camera settings Exposure time: 1/60   ISO: 100   F-number: 2.4
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 31 cd/m2
Luminance spread 63 cd/m2 (2 standard deviations)
Exposure value –1.68 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.528 x 0.704
Camera settings Exposure time: 1/40   ISO: 200   F-number: 2.4
Focal length: 0 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.