The Ultra Key in Premiere Pro is a way of quickly and efficiently 'Green/Blue Screening' or 'Chroma Keying' footage elements shot against a colored background. In this tutorial, Andrew Devis shows a slightly more advanced way to set up to use the Ultra Key in Premiere Pro which involves matting out areas of the footage that either have items to be removed or have nothing but the chroma color in them (i.e. no action in those areas). Andrew goes through the process of creating a matte that just has the item to be keyed while keeping a good soft edge to the footage by using other effects in Premiere Pro. He then creates the final matted piece and applies the Ultra Key and goes on to shows how to adjust that matte after the Ultra Key has been applied.