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

Contrast ratio results

Contrast ratio 51:1
Monitor model
Submitted 12 Jan 2012 10:42 CET, by 78.168.*.*
Camera model Nikon D90
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 1.9 s (Set EV to +9.2)
Warning: using the flash makes no sense.
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Note: image file 2: suggested exposure time: 1/27 s (Set EV to +5.5)

Black
Screen photo
[open image]
Luminance 0.64 cd/m2
Luminance spread 0.67 cd/m2 (2 standard deviations)
Exposure value –6.71 stops   (aim for –2 to –3)
Exposure spread 1.68 stops
Area used for calculation 0.624 x 0.705
Camera settings Exposure time: 1/10   ISO: 100   F-number: 2.8
Focal length: 45 mm   (35 mm equivalent)
Exposure compensation: 5
White
Screen photo
[open image]
Luminance 33 cd/m2
Luminance spread 6 cd/m2 (2 standard deviations)
Exposure value –0.04 stops   (aim for –2 to –3)
Exposure spread 0.25 stops
Area used for calculation 0.624 x 0.705
Camera settings Exposure time: 1/5   ISO: 100   F-number: 2.8
Focal length: 45 mm   (35 mm equivalent)
Exposure compensation: 8

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.