Contrast ratio | 1536:1 (edge: 3571:1) |
---|---|
Monitor model | |
Submitted | 23 Aug 2008 07:39 CEST, by 24.67.*.* |
Camera model | Canon PowerShot A460 |
Processing remarks | Warning: image file 1: Underexposed. Please increase the shutter time. |
Black | |
Screen photo |
|
Luminance | 0 cd/m2 |
Luminance spread | 0 cd/m2 (2 standard deviations) |
Exposure value | –9.04 stops (aim for –2 to –3) |
Exposure spread | 0.97 stops |
Area used for calculation | 0.534 x 0.534 |
Camera settings | Exposure time: 1 ISO: 400 F-number: 2.8 Focal length: 37 mm (35 mm equivalent) Exposure compensation: 2 |
White | |
Screen photo |
|
Luminance | 4.88 cd/m2 |
Luminance spread | 3.75 cd/m2 (2 standard deviations) |
Exposure value | –5.15 stops (aim for –2 to –3) |
Exposure spread | 1.17 stops |
Area used for calculation | 1 x 1 |
Camera settings | Exposure time: 1/40 ISO: 400 F-number: 4.5 Focal length: 98.7 mm (35 mm equivalent) Exposure compensation: -2 |
Black at screen edge | |
Screen photo |
|
Luminance | 0 cd/m2 |
Luminance spread | 0 cd/m2 (2 standard deviations) |
Exposure value | –10.26 stops (aim for –2 to –3) |
Exposure spread | 1.43 stops |
Area used for calculation | 0.534 x 0.534 |
Camera settings | Exposure time: 1 ISO: 400 F-number: 2.8 Focal length: 37 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.