Contrast ratio | 896:1 |
---|---|
Monitor model | |
Submitted | 23 Feb 2011 01:30 CET, by 75.129.*.* |
Camera model | Canon PowerShot SX200 IS |
Processing remarks | Note: image file 1: suggested exposure time: 2.2 s (Set EV to +5.2) |
Black | |
Screen photo |
|
Luminance | 0.19 cd/m2 |
Luminance spread | 0.03 cd/m2 (2 standard deviations) |
Exposure value | –3.67 stops (aim for –2 to –3) |
Exposure spread | 0.25 stops |
Area used for calculation | 0.394 x 0.394 |
Camera settings | Exposure time: 1 ISO: 400 F-number: 3.4 Focal length: 27.3 mm (35 mm equivalent) Exposure compensation: 4 |
White | |
Screen photo |
|
Luminance | 174 cd/m2 |
Luminance spread | 19 cd/m2 (2 standard deviations) |
Exposure value | –1.52 stops (aim for –2 to –3) |
Exposure spread | 0.16 stops |
Area used for calculation | 0.394 x 0.394 |
Camera settings | Exposure time: 1/202 ISO: 400 F-number: 3.4 Focal length: 27.3 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.