Generally used in film and television and other related professional industries. The common technology is virtual studio, which removes the blue-green background behind the host and adds other background walls and dynamic backgrounds. This technology will also be used in artistic wedding dresses and electronic photo albums commonly used in weddings, making places we can't or can't afford to go become the background we need. In the film and television industry, common feature films, course films and teaching films will use this technology to enrich the demonstration. As a common technique for special effects, most films of Yijing rarely use location shooting to save costs. It is no exaggeration to say that the key technology plays an important role in the one-step movie, which can complete all the work indoors. It is said that Harry Potter was shot completely indoors. Pure blue background is generally used in China, and pure green is generally used abroad (foreigners have blue eyes). Now commonly used drawing software can be picked out, but the effect may be different.