With the development of modern technology and society, information technology continues to innovate, and living standards are increasingly rising. The public’s aesthetic standards for art have also increased accordingly. At the same time as more and more information technology art is emerging in this era. New media art the audience behavior research of architectural projection art in the new media era. Among them, architectural projections based on light, shadow, and color have become widely used in various industries and exhibitions. This study analyzes the application of digital media art in urban image design and planning, and explores the practical application of digital media technology in urban landscape design by analyzing innovative means of urban landscape design. This kind of projection art has won the love of the audience with its strong immersion and stunning viewing atmosphere. In such visual works, light, shadow, and color play an important role in creating an ornamental atmosphere and shaping the style and characteristics of the work. Color and light and shadow are two important artistic expression languages included in such works. They play a crucial role. The research results indicate that the perfect integration of digital media art and urban architecture can not only meet the aesthetic needs of the public, but also shape a good urban image. The use of light and shadow and the combination of colors directly affect the visual effect of artistic works and the success or failure of artists’ artistic expression.