Contrast ratio results

Black
Contrast ratio	19:1
Monitor model
Submitted	27 Jan 2019 07:09 CET, by 98.248..
Camera model	Canon EOS DIGITAL REBEL
Processing remarks	Warning: image file 1: Underexposed. Please increase the shutter time. Note: image file 1: suggested exposure time: 5.9 s (Set EV to +2.5) Warning: image file 2: Underexposed. Please increase the shutter time. Note: image file 2: suggested exposure time: 110.3 s (Set EV to +14.8)
Screen photo	[open image]
Luminance	0.01 cd/m2
Luminance spread	0.02 cd/m2 (2 standard deviations)
Exposure value	–17.25 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.861 x 0.969
Camera settings	Exposure time: 1/250 ISO: 400 F-number: 5 Focal length: 62 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	0.16 cd/m2
Luminance spread	0.08 cd/m2 (2 standard deviations)
Exposure value	–5.05 stops (aim for –2 to –3)
Exposure spread	0.75 stops
Area used for calculation	0.861 x 0.969
Camera settings	Exposure time: 1 ISO: 400 F-number: 5 Focal length: 62 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.