Contrast ratio | 1722:1 |
---|---|
Monitor model | |
Submitted | 20 Aug 2011 23:28 CEST, by 90.190.*.* |
Camera model | Canon PowerShot A520 |
Processing remarks | image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen. |
Black | |
Screen photo |
|
Luminance | 0.19 cd/m2 |
Luminance spread | 0.13 cd/m2 (2 standard deviations) |
Exposure value | –4.92 stops (aim for –2 to –3) |
Exposure spread | 1.03 stops |
Area used for calculation | 0.5 x 0.5 |
Camera settings | Exposure time: 1/4 ISO: 400 F-number: 2.6 Focal length: 34.6 mm (35 mm equivalent) Exposure compensation: 0 |
White | |
Screen photo |
|
Luminance | 329 cd/m2 |
Luminance spread | 78 cd/m2 (2 standard deviations) |
Exposure value | –2.45 stops (aim for –2 to –3) |
Exposure spread | 0.34 stops |
Area used for calculation | 0.5 x 0.5 |
Camera settings | Exposure time: 1/1244 ISO: 400 F-number: 2.6 Focal length: 34.6 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.