Contrast ratio results for hp nc6400

Black
Contrast ratio	298:1
Monitor model	hp nc6400
Submitted	03 Apr 2013 18:03 CEST, by 216.252..
Camera model	Canon PowerShot SX120 IS
Processing remarks	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: 7.3 s (Set EV to +4.9) Warning: image file 2: automatic white balance can cause inaccuracies. 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: 1/41 s (Set EV to +3.3)
Screen photo	[open image]
Luminance	0.04 cd/m2
Luminance spread	0.07 cd/m2 (2 standard deviations)
Exposure value	–7.37 stops (aim for –2 to –3)
Exposure spread	3.32 stops
Area used for calculation	0.508 x 0.508
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 2.8 Focal length: 35.2 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	12 cd/m2
Luminance spread	8 cd/m2 (2 standard deviations)
Exposure value	–5.8 stops (aim for –2 to –3)
Exposure spread	1.06 stops
Area used for calculation	0.508 x 0.508
Camera settings	Exposure time: 1/403 ISO: 400 F-number: 2.8 Focal length: 35.2 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.