With the development of science and technology,the production methods of publicity documentaries are becoming more and more diversified.The application of Computer Graphics(CG)technology has highlighted the realistic sense of publicity documentary,created a strong visual art effect,and brought the audience an immersive audio-visual experience.Based on this,the paper expounds the three application principles of CG technology in the production of external publicity documentary:authenticity,appropriateness and artistry,and analyzes the specific application of CG technology in external publicity documentary,including three-dimensional modeling,digital landscape painting and digital color adjustment,so as to provide reference for the artistic creation of external publicity documentary.
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