Contrast ratio results

Black
Contrast ratio	9:1 (edge: 47:1)
Monitor model
Submitted	26 Jan 2014 17:42 CET, by 83.228..
Camera model	Canon PowerShot A430
Processing remarks	Warning: image file 1: camera was zoomed in too much. 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 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: using the flash makes no sense. 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. Warning: Image ISO settings are not the same. Warning: Image F-number settings are not the same. Warning: Image focal lengths/zoom levels are not the same.
Screen photo	[open image]
Luminance	374 cd/m2
Luminance spread	666 cd/m2 (2 standard deviations)
Exposure value	–1.83 stops (aim for –2 to –3)
Exposure spread	4.1 stops
Area used for calculation	0.738 x 0.415
Camera settings	Exposure time: 1/125 ISO: 63 F-number: 2.8 Focal length: 38.3 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	3399 cd/m2
Luminance spread	6431 cd/m2 (2 standard deviations)
Exposure value	–1.99 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	1 x 0.562
Camera settings	Exposure time: 1/251 ISO: 63 F-number: 6.3 Focal length: 57.6 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	72 cd/m2
Luminance spread	205 cd/m2 (2 standard deviations)
Exposure value	–2.45 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.738 x 0.415
Camera settings	Exposure time: 1/60 ISO: 102 F-number: 2.8 Focal length: 38.3 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.