| Contrast ratio | 484:1 |
|---|---|
| Monitor model | LG LCD TV 42" |
| Submitted | 10 Jan 2009 19:48 CET, by 84.217.*.* |
| Camera model | Canon EOS DIGITAL REBEL XTi |
| Processing remarks | Warning: Image F-number settings are not the same. |
| Black | |
| Screen photo |
|
| Luminance | 0.59 cd/m2 |
| Luminance spread | 0.42 cd/m2 (2 standard deviations) |
| Exposure value | –3.14 stops (aim for –2 to –3) |
| Exposure spread | 1.08 stops |
| Area used for calculation | 0.455 x 0.513 |
| Camera settings | Exposure time: 1/4 ISO: 800 F-number: 3.5 Focal length: 32.8 mm (35 mm equivalent) Exposure compensation: 0 |
| White | |
| Screen photo |
|
| Luminance | 288 cd/m2 |
| Luminance spread | 121 cd/m2 (2 standard deviations) |
| Exposure value | –2.54 stops (aim for –2 to –3) |
| Exposure spread | 0.62 stops |
| Area used for calculation | 0.76 x 0.858 |
| Camera settings | Exposure time: 1/500 ISO: 800 F-number: 5.6 Focal length: 54.8 mm (35 mm equivalent) Exposure compensation: 0 |
![[open image]](upload/cr004/01054a.jpg){kind=link}
![[open image]](upload/cr004/01054b.jpg){kind=link}
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.