Contrast ratio results for Seiko/Epson

Black
Contrast ratio	307:1
Monitor model	Seiko/Epson
Submitted	05 Jun 2011 20:42 CEST, by 109.173..
Camera model	Canon PowerShot A460
Processing remarks	image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 0.7 s (Set EV to +1.5) image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. image file 3: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	0.41 cd/m2
Luminance spread	0.84 cd/m2 (2 standard deviations)
Exposure value	–4.04 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.534 x 0.534
Camera settings	Exposure time: 1/4 ISO: 400 F-number: 2.8 Focal length: 37 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	125 cd/m2
Luminance spread	23 cd/m2 (2 standard deviations)
Exposure value	–1.75 stops (aim for –2 to –3)
Exposure spread	0.27 stops
Area used for calculation	0.534 x 0.534
Camera settings	Exposure time: 1/251 ISO: 400 F-number: 2.8 Focal length: 37 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	62 cd/m2
Luminance spread	114 cd/m2 (2 standard deviations)
Exposure value	–1.75 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.534 x 0.534
Camera settings	Exposure time: 1/125 ISO: 400 F-number: 2.8 Focal length: 37 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.