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

Contrast ratio results

Contrast ratio 11:1
Monitor model
Submitted 17 Jul 2016 22:45 CEST, by 162.227.*.*
Camera model Canon PowerShot SD4500 IS
Processing remarks

Warning: using the flash makes no sense.
Warning: image file 1: automatic white balance can cause inaccuracies.
image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Note: image file 1: suggested exposure time: 1/130 s (Set EV to -1.1)
Warning: image file 2: automatic white balance can cause inaccuracies.
image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 2: Overexposed. Please decrease the shutter time.
Warning: Image ISO settings are not the same.

Black
Screen photo
[open image]
Luminance 28 cd/m2
Luminance spread 37 cd/m2 (2 standard deviations)
Exposure value –1.38 stops   (aim for –2 to –3)
Exposure spread 2.24 stops
Area used for calculation 0.51 x 0.51
Camera settings Exposure time: 1/60   ISO: 800   F-number: 3.4
Focal length: 35.3 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
[open image]
Luminance 303 cd/m2
Luminance spread 534 cd/m2 (2 standard deviations)
Exposure value –1.7 stops   (aim for –2 to –3)
Exposure spread 3.98 stops
Area used for calculation 0.51 x 0.51
Camera settings Exposure time: 1/318   ISO: 320   F-number: 3.4
Focal length: 35.3 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.