Contrast ratio results for hp?

Black
Contrast ratio	1021:1
Monitor model	hp?
Submitted	10 Feb 2008 22:10 CET, by 82.139..
Camera model	Pentax K100D
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 7.0 s (Set EV to +2.2) Note: image file 2: suggested exposure time: 1/150 s (Set EV to -1.7)
Screen photo	[open image]
Luminance	0.11 cd/m2
Luminance spread	0.02 cd/m2 (2 standard deviations)
Exposure value	–4.71 stops (aim for –2 to –3)
Exposure spread	0.32 stops
Area used for calculation	0.37 x 0.42
Camera settings	Exposure time: 1.5 ISO: 400 F-number: 4.5 Focal length: 27 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	112 cd/m2
Luminance spread	12 cd/m2 (2 standard deviations)
Exposure value	–0.79 stops (aim for –2 to –3)
Exposure spread	0.16 stops
Area used for calculation	0.37 x 0.42
Camera settings	Exposure time: 1/45 ISO: 400 F-number: 4.5 Focal length: 27 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.