 While Jackson insisted on generally using miniatures, sometimes shots would get too difficult for that, primarily with the digital characters.Sometimes natural elements like cloud, dust and fire (which was used as the electronic data for the Wraithworld scenes and the Balrog) would be composited, and natural environments were composited to create the Pelennor Fields.To give a "painterly" look to the films, cinematographer Peter Doyle worked on every scene within the computer to strengthen colours and add extra mood and tone to the proceedings.