Contrast ratio | 1442:1 |
---|---|
Monitor model | ASUS VH242H 23.6" |
Submitted | 14 Feb 2009 17:24 CET, by 71.231.*.* |
Camera model | Canon PowerShot A640 |
Processing remarks | Warning: image file 1: Underexposed. Please increase the shutter time. |
Black | |
Screen photo |
|
Luminance | 0.11 cd/m2 |
Luminance spread | 0.11 cd/m2 (2 standard deviations) |
Exposure value | –10.54 stops (aim for –2 to –3) |
Exposure spread | 1.59 stops |
Area used for calculation | 0.488 x 0.488 |
Camera settings | Exposure time: 1/101 ISO: 408 F-number: 2.8 Focal length: 33.8 mm (35 mm equivalent) Exposure compensation: 0 |
White | |
Screen photo |
|
Luminance | 161 cd/m2 |
Luminance spread | 4 cd/m2 (2 standard deviations) |
Exposure value | –0.04 stops (aim for –2 to –3) |
Exposure spread | 0.04 stops |
Area used for calculation | 0.488 x 0.488 |
Camera settings | Exposure time: 1/101 ISO: 408 F-number: 2.8 Focal length: 33.8 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.