In Premiere Pro if you have the Video Previews set to I-Frame MPEG you'll never get a clean 10bit render because that's a very lossy compression.
Switch that to DNxHD or ProRes 10bit and you should get a cleaner render. That's what we do for all final renders from the Master Timeline.
Walter Biscardi, Jr.
Editor, Colorist, Director, Writer, Consultant, Author, Chef.
HD Post and Production
Biscardi Creative Media
"This American Land" - our new PBS Series.
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