Contrast ratio results

Black
Contrast ratio	119:1
Monitor model
Submitted	29 Mar 2008 05:33 CET, by 216.59..
Camera model	Hewlett-Packard HP PhotoSmart C945 V01.7
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 file 2: Underexposed. Please increase the shutter time. Note: image file 2: suggested exposure time: 1/67 s (Set EV to +2.4)
Screen photo	[open image]
Luminance	0.18 cd/m2
Luminance spread	0.05 cd/m2 (2 standard deviations)
Exposure value	–3.34 stops (aim for –2 to –3)
Exposure spread	0.44 stops
Area used for calculation	0.535 x 0.533
Camera settings	Exposure time: 1 ISO: 400 F-number: 2.9 Focal length: 37 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	21 cd/m2
Luminance spread	15 cd/m2 (2 standard deviations)
Exposure value	–4.93 stops (aim for –2 to –3)
Exposure spread	1.08 stops
Area used for calculation	0.535 x 0.533
Camera settings	Exposure time: 1/359 ISO: 400 F-number: 2.9 Focal length: 37 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.