Contrast ratio results for Viewsonic VX2260

Black
Contrast ratio	687:1
Monitor model	Viewsonic VX2260
Submitted	18 Jul 2009 00:37 CEST, by 69.242..
Camera model	Canon PowerShot SD870 IS
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: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 2.9 s (Set EV to -0.1) Warning: image file 2: camera was zoomed in too much. Warning: image file 2: automatic white balance can cause inaccuracies.
Screen photo	[open image]
Luminance	0.16 cd/m2
Luminance spread	0.07 cd/m2 (2 standard deviations)
Exposure value	–4.36 stops (aim for –2 to –3)
Exposure spread	0.63 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 0.8 ISO: 800 F-number: 5 Focal length: 75 mm (35 mm equivalent) Exposure compensation: -2
White
Screen photo	[open image]
Luminance	112 cd/m2
Luminance spread	38 cd/m2 (2 standard deviations)
Exposure value	–3.27 stops (aim for –2 to –3)
Exposure spread	0.5 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/403 ISO: 800 F-number: 5 Focal length: 75 mm (35 mm equivalent) Exposure compensation: -2

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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.