Contrast ratio results

Black
Contrast ratio	16:1
Monitor model
Submitted	07 Oct 2012 14:07 CEST, by 79.118..
Camera model	Pentax K10D
Processing remarks	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 1: Overexposed. Please decrease the shutter time. Note: image file 1: suggested exposure time: 0.3 s (Set EV to +2.2) 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. Note: image file 2: suggested exposure time: 1/46 s (Set EV to -1.1)
Screen photo	[open image]
Luminance	2.24 cd/m2
Luminance spread	13.22 cd/m2 (2 standard deviations)
Exposure value	–3.95 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.793 x 0.888
Camera settings	Exposure time: 1/8 ISO: 400 F-number: 4.5 Focal length: 57 mm (35 mm equivalent) Exposure compensation: 0.7
White
Screen photo	[open image]
Luminance	36 cd/m2
Luminance spread	49 cd/m2 (2 standard deviations)
Exposure value	–0.66 stops (aim for –2 to –3)
Exposure spread	2.47 stops
Area used for calculation	0.793 x 0.888
Camera settings	Exposure time: 1/13 ISO: 400 F-number: 4.5 Focal length: 57 mm (35 mm equivalent) Exposure compensation: 0.7

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.