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How do I get rid of color banding in background when I export animation video. See attached picture
If you have not already done so, try taking one of the sample projects such as Gatehouse.dwg (C:\Program Files\Autodesk\Navisworks Manage 2014\Samples\gatehouse), setup a graduated background, and see if you get the same result.
If you are seeing the same result with the sample project, this may be related to the animation output format. What options are you setting in the Animation Export dialog (and have you tried exporting using different options)?