This invention discloses an image transmission and display method complies with both chromaticity and visual fidelity principles. It is in the technical field of image transmission and display. In order to totally eliminate factors that affect image reproduction fidelity during process of image transmission and reproduction on display devices (including channel independence and space independence of three primary colors, red-shift effect, gamma correction, methods to generate brightness information and chromatic difference information, gamma correction for all kinds of display devices), this invention created a set of mathematical models and methods. With the invention, data flows are processed complying with both chromaticity and visual fidelity to ensure hues of reproduced image on display device remain unchanged, gray is reproduced accurately and chromaticity coordinates ratio remains unchanged as well. This is a universal method to ensure fidelity for image transmission and display, and can be widely applied on televisions, computers and mobile telecommunication devices. Furthermore, it provides support of chromaticity and methodology for color management system, design and development of associated software and hardware, and system which is a combination of digital high definition television and computer.