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

Contrast ratio results

Contrast ratio 3004:1 (edge: 6925:1)
Monitor model
Submitted 30 Jan 2018 05:41 CET, by 73.101.*.*
Camera model Canon PowerShot SX720 HS
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: 730.2 s (Set EV to +9.5)
Warning: image file 2: automatic white balance can cause inaccuracies.
Warning: image file 2: Underexposed. Please increase the shutter time.
Note: image file 2: suggested exposure time: 1/4 s (Set EV to +4.9)
Warning: image file 3: automatic white balance can cause inaccuracies.
Warning: image file 3: Underexposed. Please increase the shutter time.
Note: image file 3: suggested exposure time: 1683.2 s (Set EV to +10.7)

Black
Screen photo
[open image]
Luminance 0.01 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –12.01 stops   (aim for –2 to –3)
Exposure spread 0.64 stops
Area used for calculation 0.345 x 0.345
Camera settings Exposure time: 1   ISO: 80   F-number: 5
Focal length: 23.9 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 19 cd/m2
Luminance spread 6 cd/m2 (2 standard deviations)
Exposure value –7.43 stops   (aim for –2 to –3)
Exposure spread 0.48 stops
Area used for calculation 0.345 x 0.345
Camera settings Exposure time: 1/125   ISO: 80   F-number: 5
Focal length: 23.9 mm   (35 mm equivalent)
Exposure compensation: 0
Black at screen edge
Screen photo
[open image]
Luminance 0 cd/m2
Luminance spread 0 cd/m2 (2 standard deviations)
Exposure value –13.22 stops   (aim for –2 to –3)
Exposure spread 1.02 stops
Area used for calculation 0.345 x 0.345
Camera settings Exposure time: 1   ISO: 80   F-number: 5
Focal length: 23.9 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.