Hi, Dannington Thank you very much for your reply. i do not think that is the composure, the video feed from the blackmagic video card in Media Bundle is the same with wrong color, you are right this is the video plate material problem, but i can not fin the srgb to linear converter BP in the Unreal, how i change the video plate material to linear color , there is a linked , may be that will help, i will have a try when i get back to studio , Linear RGB in UE4 - Community Content, Tools and Tutorials - Unreal Engine Forums