Contrast ratio | 1765:1 |
---|---|
Monitor model | HF255 |
Submitted | 15 Sep 2012 00:21 CEST, by 98.87.*.* |
Camera model | Apple iPad |
Processing remarks | Warning: image file 1: automatic white balance can cause inaccuracies. |
Black | |
Screen photo |
|
Luminance | 0.09 cd/m2 |
Luminance spread | 0.05 cd/m2 (2 standard deviations) |
Exposure value | –6.42 stops (aim for –2 to –3) |
Exposure spread | 0.79 stops |
Area used for calculation | 0.505 x 0.507 |
Camera settings | Exposure time: 1/15 ISO: 1000 F-number: 2.4 Focal length: 35 mm (35 mm equivalent) Exposure compensation: 0 |
White | |
Screen photo |
|
Luminance | 152 cd/m2 |
Luminance spread | 16 cd/m2 (2 standard deviations) |
Exposure value | –0.96 stops (aim for –2 to –3) |
Exposure spread | 0.16 stops |
Area used for calculation | 0.505 x 0.507 |
Camera settings | Exposure time: 1/60 ISO: 100 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.