Contrast ratio | 157817:1 (edge: 136363:1) |
---|---|
Monitor model | Samsung LN46A950 |
Submitted | 21 Jun 2009 19:12 CEST, by 70.70.*.* |
Camera model | Canon PowerShot A75 |
Processing remarks | image file 1: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time. |
Black | |
Screen photo |
|
Luminance | 0 cd/m2 |
Luminance spread | 0 cd/m2 (2 standard deviations) |
Exposure value | –8.98 stops (aim for –2 to –3) |
Exposure spread | 1.95 stops |
Area used for calculation | 0.5 x 0.5 |
Camera settings | Exposure time: 1 ISO: 400 F-number: 2.8 Focal length: 34.6 mm (35 mm equivalent) Exposure compensation: -2 |
White | |
Screen photo |
|
Luminance | 523 cd/m2 |
Luminance spread | 64 cd/m2 (2 standard deviations) |
Exposure value | –2 stops (aim for –2 to –3) |
Exposure spread | 0.18 stops |
Area used for calculation | 0.5 x 0.5 |
Camera settings | Exposure time: 1/1244 ISO: 400 F-number: 2.8 Focal length: 34.6 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 | –8.77 stops (aim for –2 to –3) |
Exposure spread | 1.9 stops |
Area used for calculation | 0.5 x 0.5 |
Camera settings | Exposure time: 1 ISO: 400 F-number: 2.8 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.