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Although TV cards are cool, they are not as common as digital cameras, scanners, and web- cams. Unfortunately, this is where hardware support really becomes hit-and-miss. My eight- year-old SCSI scanner is supported, whereas my newer USB scanner is not. And although both of my digital cameras can work as webcams under Windows, neither can work as webcams under Linux.
Not every camera provides the same compatibility. If your camera does not support a capture mode, then you cannot use the computer to take pictures with it and you cannot use it as a high- resolution webcam.
A tool that you may want to consider installing is gphoto2. This program provides support for over 700 different camera models. It enables you to scan for compatibility with the camera and query supported functionality.