Contrast ratio results for LG

Black
Contrast ratio	601:1
Monitor model	LG
Submitted	06 Dec 2011 22:33 CET, by 85.238..
Camera model	Pentax K200D
Processing remarks	Warning: image file 1: camera was zoomed in too much. Warning: image file 1: automatic white balance can cause inaccuracies. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 1/5 s (Set EV to +6.2) Warning: image file 2: camera was zoomed in too much. Warning: image file 2: automatic white balance can cause inaccuracies. Warning: image file 2: Underexposed. Please increase the shutter time. Note: image file 2: suggested exposure time: 42.0 s (Set EV to +5.4) Warning: image file 3: camera was zoomed in too much. Warning: image file 3: automatic white balance can cause inaccuracies. Warning: image file 3: Underexposed. Please increase the shutter time. Note: image file 3: suggested exposure time: 1/21 s (Set EV to +4.2) Warning: Image F-number settings are not the same. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	0.03 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–7.89 stops (aim for –2 to –3)
Exposure spread	0.72 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1 ISO: 400 F-number: 5.6 Focal length: 82 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	17 cd/m2
Luminance spread	4 cd/m2 (2 standard deviations)
Exposure value	–8.67 stops (aim for –2 to –3)
Exposure spread	0.36 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 9 Focal length: 82 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	32 cd/m2
Luminance spread	14 cd/m2 (2 standard deviations)
Exposure value	–6.74 stops (aim for –2 to –3)
Exposure spread	0.65 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 6.3 Focal length: 82 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.