The embodiment of the invention provides a method and system for processing image signals and a displayer, and relates to the technical field of displaying. The method includes the steps of receiving video signals, collecting environment parameter information of the display environment where the system is located, adjusting the luminance and/or the chromaticity of the video signals according to the environment parameter information to correspondingly adjust light with at least one color spectrum of the video signals, and outputting the adjusted video signals. According to the method for processing the image signals, the light in the specific spectrum color can be adjusted according to the viewing environment to relieve visual fatigue.