Contrast ratio results for acer

Black
Contrast ratio	8354:1
Monitor model	acer
Submitted	09 Jan 2014 18:31 CET, by 86.126..
Camera model	Canon EOS 550D
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 16.1 s (Set EV to +6.0) image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.
Screen photo	[open image]
Luminance	0.03 cd/m2
Luminance spread	0.01 cd/m2 (2 standard deviations)
Exposure value	–8.5 stops (aim for –2 to –3)
Exposure spread	0.35 stops
Area used for calculation	0.393 x 0.442
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 3.5 Focal length: 28.3 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	241 cd/m2
Luminance spread	77 cd/m2 (2 standard deviations)
Exposure value	–1.48 stops (aim for –2 to –3)
Exposure spread	0.46 stops
Area used for calculation	0.393 x 0.442
Camera settings	Exposure time: 1/256 ISO: 400 F-number: 3.5 Focal length: 28.3 mm (35 mm equivalent) Exposure compensation: 0

{adcode}

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.