The camera may be out of focus. Rotate the lens to change the focus. Depending on how quickly the image is refreshing, you may need to turn the lens, wait a few seconds, and repeat until the image is clear.
The subject may appear dark if there is a bright light source in the background. Turn off lamps or close shades that are behind the subject.
Changes may have been made in the Video Device Properties window Settings tab. Click the Default button to restore the factory settings.
Clean the lens.
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