Contrast ratio | 1137:1 (edge: 1486:1) |
---|---|
Monitor model | Acer P221W |
Submitted | 12 Jan 2010 06:54 CET, by 24.16.*.* |
Camera model | Nikon COOLPIX S550 |
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 | 0.14 cd/m2 |
Luminance spread | 0.04 cd/m2 (2 standard deviations) |
Exposure value | –4.22 stops (aim for –2 to –3) |
Exposure spread | 0.38 stops |
Area used for calculation | 0.52 x 0.52 |
Camera settings | Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 36 mm (35 mm equivalent) Exposure compensation: 1 |
White | |
Screen photo |
|
Luminance | 159 cd/m2 |
Luminance spread | 19 cd/m2 (2 standard deviations) |
Exposure value | –1.03 stops (aim for –2 to –3) |
Exposure spread | 0.17 stops |
Area used for calculation | 0.52 x 0.52 |
Camera settings | Exposure time: 1/124 ISO: 400 F-number: 3.5 Focal length: 36 mm (35 mm equivalent) Exposure compensation: 0.3 |
Black at screen edge | |
Screen photo |
|
Luminance | 0.11 cd/m2 |
Luminance spread | 0.04 cd/m2 (2 standard deviations) |
Exposure value | –4.61 stops (aim for –2 to –3) |
Exposure spread | 0.49 stops |
Area used for calculation | 0.52 x 0.52 |
Camera settings | Exposure time: 1 ISO: 400 F-number: 3.5 Focal length: 36 mm (35 mm equivalent) Exposure compensation: 1 |
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.