Contrast ratio | 621:1 |
---|---|
Monitor model | |
Submitted | 19 Feb 2010 22:54 CET, by 85.204.*.* |
Camera model | Canon PowerShot A720 IS |
Processing remarks |
|
Black | |
Screen photo |
|
Luminance | 0.22 cd/m2 |
Luminance spread | 0.05 cd/m2 (2 standard deviations) |
Exposure value | –3.26 stops (aim for –2 to –3) |
Exposure spread | 0.32 stops |
Area used for calculation | 0.495 x 0.495 |
Camera settings | Exposure time: 8 ISO: 80 F-number: 4 Focal length: 34.3 mm (35 mm equivalent) Exposure compensation: 0 |
White | |
Screen photo |
|
Luminance | 139 cd/m2 |
Luminance spread | 13 cd/m2 (2 standard deviations) |
Exposure value | –2.89 stops (aim for –2 to –3) |
Exposure spread | 0.13 stops |
Area used for calculation | 0.495 x 0.495 |
Camera settings | Exposure time: 1/60 ISO: 80 F-number: 4 Focal length: 34.3 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.