Contrast ratio | 510:1 |
---|---|
Monitor model | Apple Macbook Air 13 2011 |
Submitted | 17 May 2012 15:47 CEST, by 2.109.*.* |
Camera model | Panasonic DMC-GF1 |
Processing remarks | Note: image file 1: suggested exposure time: 0.9 s (Set EV to -1.5) |
Black | |
Screen photo |
|
Luminance | 0.12 cd/m2 |
Luminance spread | 0.08 cd/m2 (2 standard deviations) |
Exposure value | –1 stops (aim for –2 to –3) |
Exposure spread | 0.95 stops |
Area used for calculation | 0.578 x 0.578 |
Camera settings | Exposure time: 2.5 ISO: 400 F-number: 1.7 Focal length: 40 mm (35 mm equivalent) Exposure compensation: 0 |
White | |
Screen photo |
|
Luminance | 63 cd/m2 |
Luminance spread | 25 cd/m2 (2 standard deviations) |
Exposure value | –1.97 stops (aim for –2 to –3) |
Exposure spread | 0.58 stops |
Area used for calculation | 0.578 x 0.578 |
Camera settings | Exposure time: 1/400 ISO: 400 F-number: 1.7 Focal length: 40 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.