As the core carrier of visual communication, graphic design has long regarded color as its soul element: it not only determines the overall tone of visual effects, but also undertakes the functions of information transmission and emotional arousal. Starting from the technical characteristics of color in digital imaging art, this paper systematically analyzes its innovative role in the expressive dimensions of color in graphic design, discusses its influence on public aesthetic tastes, and reveals the transformation path of color in graphic design from "static symbols" to "dynamic narrative carriers" through empirical research on typical cases. Meanwhile, it reflects on issues such as color homogenization and aesthetic fatigue driven by technology. This is of great significance for grasping the development trend of "color-driven innovation" in the graphic design industry and its adaptability to the times.