function imrgb=lum2rgb(imlum)
    Y=imlum(:,:,1);
    U=imlum(:,:,2);
    V=imlum(:,:,3);
    b=U+Y;
    r=V+Y;
    g=(Y-0.299*r-0.114*b)/(0.587);
    imrgb(:,:,1)=r;
    imrgb(:,:,2)=g;
    imrgb(:,:,3)=b;