Contrast ratio results

Black
Contrast ratio	45:1
Monitor model
Submitted	09 Oct 2016 13:38 CEST, by 86.127..
Camera model	Canon EOS 350D DIGITAL
Processing remarks	Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: image file 2: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). Warning: image file 2: automatic white balance can cause inaccuracies. image file 2: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: Image ISO settings are not the same. Warning: Image F-number settings are not the same. Warning: Images were taken with different cameras. Warning: Image focal lengths/zoom levels are not the same.
Screen photo	[open image]
Luminance	116 cd/m2
Luminance spread	81 cd/m2 (2 standard deviations)
Exposure value	–2.84 stops (aim for –2 to –3)
Exposure spread	1.05 stops
Area used for calculation	0.528 x 0.293
Camera settings	Exposure time: 1/72 ISO: 50 F-number: 2.6 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	5193 cd/m2
Luminance spread	9355 cd/m2 (2 standard deviations)
Exposure value	–2.15 stops (aim for –2 to –3)
Exposure spread	4.25 stops
Area used for calculation	0.528 x 0.458
Camera settings	Exposure time: 1/320 ISO: 200 F-number: 13 Focal length: 0 mm (35 mm equivalent) Exposure compensation: -1

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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.