Contrast ratio results

Black
Contrast ratio	30:1
Monitor model
Submitted	05 Jun 2012 11:32 CEST, by 78.52..
Camera model	Pentax Optio S5z
Processing remarks	Warning: image file 1: camera was zoomed in too much. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 3.8 s (Set EV to +1.6) Warning: image file 2: camera was zoomed in too much.
Screen photo	[open image]
Luminance	1.14 cd/m2
Luminance spread	0.48 cd/m2 (2 standard deviations)
Exposure value	–4.06 stops (aim for –2 to –3)
Exposure spread	0.61 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1.3 ISO: 80 F-number: 4.8 Focal length: 105 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	34 cd/m2
Luminance spread	13 cd/m2 (2 standard deviations)
Exposure value	–3.46 stops (aim for –2 to –3)
Exposure spread	0.56 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/15 ISO: 80 F-number: 4.8 Focal length: 105 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.