Contrast ratio | 6452:1 |
---|---|
Monitor model | samsung s27a950d |
Submitted | 16 Aug 2012 10:51 CEST, by 220.235.*.* |
Camera model | Apple iPhone 4S |
Processing remarks | Warning: image file 1: automatic white balance can cause inaccuracies. |
Black | |
Screen photo |
|
Luminance | 0.02 cd/m2 |
Luminance spread | 0.03 cd/m2 (2 standard deviations) |
Exposure value | –8.56 stops (aim for –2 to –3) |
Exposure spread | 2.24 stops |
Area used for calculation | 0.506 x 0.506 |
Camera settings | Exposure time: 1/15 ISO: 800 F-number: 2.4 Focal length: 35 mm (35 mm equivalent) Exposure compensation: 0 |
White | |
Screen photo |
|
Luminance | 157 cd/m2 |
Luminance spread | 33 cd/m2 (2 standard deviations) |
Exposure value | –1.23 stops (aim for –2 to –3) |
Exposure spread | 0.3 stops |
Area used for calculation | 0.506 x 0.506 |
Camera settings | Exposure time: 1/60 ISO: 80 F-number: 2.4 Focal length: 35 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.