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

Contrast ratio results

Contrast ratio 5028:1
Monitor model
Submitted 25 Jun 2013 19:58 CEST, by 88.122.*.*
Camera model Canon PowerShot G7
Processing remarks

Warning: image file 1: automatic white balance can cause inaccuracies.
Warning: image file 1: Underexposed. Please increase the shutter time.
Note: image file 1: suggested exposure time: 47.9 s (Set EV to +5.6)
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 3: automatic white balance can cause inaccuracies.
image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 3: suggested exposure time: 1/85 s (Set EV to -1.1)
Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?

Black
Screen photo
[open image]
Luminance 0.02 cd/m2
Luminance spread 0.02 cd/m2 (2 standard deviations)
Exposure value –8.08 stops   (aim for –2 to –3)
Exposure spread 0.92 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1   ISO: 100   F-number: 2.8
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 124 cd/m2
Luminance spread 13 cd/m2 (2 standard deviations)
Exposure value –1.69 stops   (aim for –2 to –3)
Exposure spread 0.15 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1/60   ISO: 100   F-number: 2.8
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 101 cd/m2
Luminance spread 110 cd/m2 (2 standard deviations)
Exposure value –1.41 stops   (aim for –2 to –3)
Exposure spread 1.75 stops
Area used for calculation 0.495 x 0.495
Camera settings Exposure time: 1/40   ISO: 100   F-number: 2.8
Focal length: 34.3 mm   (35 mm equivalent)
Exposure compensation: 0
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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.