Contrast ratio results

Black
Contrast ratio	991:1
Monitor model
Submitted	29 Mar 2016 02:25 CEST, by 81.36..
Camera model	Canon EOS M
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 0.6 s (Set EV to +0.7) Warning: image file 2: Overexposed. Please decrease the shutter time.
Screen photo	[open image]
Luminance	0.23 cd/m2
Luminance spread	0.14 cd/m2 (2 standard deviations)
Exposure value	–4.2 stops (aim for –2 to –3)
Exposure spread	0.92 stops
Area used for calculation	0.485 x 0.545
Camera settings	Exposure time: 1/5 ISO: 400 F-number: 2 Focal length: 34.9 mm (35 mm equivalent) Exposure compensation: -1
White
Screen photo	[open image]
Luminance	231 cd/m2
Luminance spread	10 cd/m2 (2 standard deviations)
Exposure value	–0.3 stops (aim for –2 to –3)
Exposure spread	0.06 stops
Area used for calculation	0.485 x 0.545
Camera settings	Exposure time: 1/332 ISO: 400 F-number: 2 Focal length: 34.9 mm (35 mm equivalent) Exposure compensation: 2

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.