Contrast ratio results for HP w2007

Black
Contrast ratio	484:1
Monitor model	HP w2007
Submitted	26 Aug 2008 14:20 CEST, by 70.95..
Camera model	Canon PowerShot SD550
Processing remarks	image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: Image F-number settings are not the same.
Screen photo	[open image]
Luminance	0.51 cd/m2
Luminance spread	0.58 cd/m2 (2 standard deviations)
Exposure value	–2.45 stops (aim for –2 to –3)
Exposure spread	1.87 stops
Area used for calculation	0.521 x 0.521
Camera settings	Exposure time: 0.6 ISO: 400 F-number: 2.8 Focal length: 36.1 mm (35 mm equivalent) Exposure compensation: 1
White
Screen photo	[open image]
Luminance	247 cd/m2
Luminance spread	73 cd/m2 (2 standard deviations)
Exposure value	–3.14 stops (aim for –2 to –3)
Exposure spread	0.43 stops
Area used for calculation	0.521 x 0.521
Camera settings	Exposure time: 1/202 ISO: 400 F-number: 7.1 Focal length: 36.1 mm (35 mm equivalent) Exposure compensation: -1

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.