Contrast ratio results

Black
Contrast ratio	1:1
Monitor model
Submitted	10 Nov 2013 09:35 CET, by 78.63..
Camera model	Pentax K100D
Processing remarks	Warning: using the flash makes no sense. Warning: image file 1: automatic white balance can cause inaccuracies. image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. Warning: using the flash makes no sense. Warning: image file 2: camera was zoomed in too much. 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: using the flash makes no sense. Warning: image file 3: automatic white balance can cause inaccuracies. image file 3: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. Warning: Image F-number settings are not the same. Warning: Image focal lengths/zoom levels are not the same. Warning: image file 3 is too bright to be a dark photo. Maybe you mixed up the files?
Screen photo	[open image]
Luminance	69 cd/m2
Luminance spread	73 cd/m2 (2 standard deviations)
Exposure value	–1.92 stops (aim for –2 to –3)
Exposure spread	1.71 stops
Area used for calculation	0.888 x 1
Camera settings	Exposure time: 1/60 ISO: 400 F-number: 4.5 Focal length: 64 mm (35 mm equivalent) Exposure compensation: 0
White
Screen photo	[open image]
Luminance	87 cd/m2
Luminance spread	154 cd/m2 (2 standard deviations)
Exposure value	–2.21 stops (aim for –2 to –3)
Exposure spread	4.02 stops
Area used for calculation	1 x 1
Camera settings	Exposure time: 1/60 ISO: 400 F-number: 5.6 Focal length: 82 mm (35 mm equivalent) Exposure compensation: 0
Black at screen edge
Screen photo	[open image]
Luminance	67 cd/m2
Luminance spread	104 cd/m2 (2 standard deviations)
Exposure value	–2.59 stops (aim for –2 to –3)
Exposure spread	3.01 stops
Area used for calculation	0.999 x 1
Camera settings	Exposure time: 1/60 ISO: 400 F-number: 5.6 Focal length: 72 mm (35 mm equivalent) Exposure compensation: 0

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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.