Contrast ratio | 197:1 |
---|---|
Monitor model | hp tx2 laptop screen |
Submitted | 19 May 2010 19:53 CEST, by 75.187.*.* |
Camera model | SAMSUNG TECHWIN CO. LTD. Digimax L85 |
Processing remarks | Warning: image file 1: could not determine angle of view; assuming 38 mm lens (35 mm equivalent). |
Black | |
Screen photo |
|
Luminance | 0.98 cd/m2 |
Luminance spread | 1.42 cd/m2 (2 standard deviations) |
Exposure value | –1.87 stops (aim for –2 to –3) |
Exposure spread | 2.62 stops |
Area used for calculation | 0.528 x 0.528 |
Camera settings | Exposure time: 0.5 ISO: 400 F-number: 2.9 Focal length: 0 mm (35 mm equivalent) Exposure compensation: 0 |
White | |
Screen photo |
|
Luminance | 193 cd/m2 |
Luminance spread | 25 cd/m2 (2 standard deviations) |
Exposure value | –1.22 stops (aim for –2 to –3) |
Exposure spread | 0.19 stops |
Area used for calculation | 0.528 x 0.528 |
Camera settings | Exposure time: 1/250 ISO: 400 F-number: 2.9 Focal length: 0 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.