End-user programs can also benefit from light sensors. Programs can apply a theme that is appropriate for a particular lighting condition, such as a specific outdoor theme and indoor theme. Perhaps the most important aspect of light sensor integration with programs is readability and legibility optimizations that are based on lighting conditions.
Suppose you want to use your computer to help you navigate to a new restaurant. You start out in your house, looking up the address of the restaurant and planning your route. The following screen shot shows how your navigation program could optimize its UI to show detailed information in indoor lighting conditions. When you go outside to your car, you encounter direct sunlight, which makes the laptop's screen difficult to read.
In this view, much of the detail has been omitted and contrast is maximized. As you get closer to the restaurant, evening approaches and it gets dark outside. Ambient light sensors can measure current lighting conditions. You can use data from light sensors to automatically adjust screen brightness and keyboard illumination. You can also create light-aware applications that adjust user interface elements for current lighting conditions.
In Windows 8, automatic brightness control with ambient light sensors adaptive brightness is fully supported. Windows 8 includes class driver support for both ACPI 3. This means that you do not have to write custom drivers to support ambient light sensors. These sensors can also be used by Sensor API-based client applications, because these drivers integrate with the Windows Sensor and Location platform.
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