Contrast ratio results for Samsung BX2440

Black
Contrast ratio	185:1
Monitor model	Samsung BX2440
Submitted	08 Aug 2010 22:20 CEST, by 99.108..
Camera model	Canon EOS DIGITAL REBEL XT
Processing remarks	Warning: image file 1: Overexposed. Please decrease the shutter time. Note: image file 1: suggested exposure time: 0.3 s (Set EV to -1.9) image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Screen photo	[open image]
Luminance	1.72 cd/m2
Luminance spread	0.6 cd/m2 (2 standard deviations)
Exposure value	–0.61 stops (aim for –2 to –3)
Exposure spread	0.51 stops
Area used for calculation	0.39 x 0.439
Camera settings	Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 28.1 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	318 cd/m2
Luminance spread	34 cd/m2 (2 standard deviations)
Exposure value	–1.72 stops (aim for –2 to –3)
Exposure spread	0.16 stops
Area used for calculation	0.39 x 0.439
Camera settings	Exposure time: 1/400 ISO: 400 F-number: 3.5 Focal length: 28.1 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.