Contrast ratio results

Contrast ratio 2:1
Monitor model
Submitted 28 Aug 2014 09:30 CEST, by 86.161.*.*
Camera model RICOH Caplio R5
Processing remarks

Warning: using the flash makes no sense.
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.
image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 1: Overexposed. Please decrease the shutter time.
Warning: using the flash makes no sense.
Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent).
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.
Note: image file 2: suggested exposure time: 1/230 s (Set EV to -1.4)
Warning: Image F-number settings are not the same.
Warning: Image focal lengths/zoom levels are not the same.

Black
Screen photo
Luminance 137 cd/m2
Luminance spread 325 cd/m2 (2 standard deviations)
Exposure value –2.62 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/73   ISO: 383   F-number: 7.2
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: -0.3
White
Screen photo
Luminance 270 cd/m2
Luminance spread 446 cd/m2 (2 standard deviations)
Exposure value –1.38 stops   (aim for –2 to –3)
Exposure spread 3.38 stops
Area used for calculation 0.528 x 0.528
Camera settings Exposure time: 1/104   ISO: 383   F-number: 5.5
Focal length: 0 mm   (35 mm equivalent)
Exposure compensation: -0.3

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.