RGB Image to YIQ Image

YIQ  builds the basis for the NTSC (National Television System Commitee) format.
The Component division of YIQ :
Y=0.30R+0.59G+0.11B
I=0.60R-0.28G-0.32B
Q=0.21R-0.52G+0.31B


MATLAB code:
Im=imread('peppers.png');


figure,imshow(Im);
title('Original Image')

%y=0.2989 * R + 0.5870 * G + 0.1140 * B 

%I=0.60*R - 0.28*G-0.32*B

%Q=0.21*R -0.52*G+0.31*B

YIQ=uint8(zeros(size(Im)));
for i=1:size(Im,1)
    for j=1:size(Im,2)
        YIQ(i,j,1)=0.2989*Im(i,j,1)+0.5870*Im(i,j,2)+0.1140*Im(i,j,3);
        YIQ(i,j,2)=0.596*Im(i,j,1)-0.274*Im(i,j,2)-0.322*Im(i,j,3);
        YIQ(i,j,3)=0.211*Im(i,j,1)-0.523*Im(i,j,2)+0.312*Im(i,j,3);
    end
end
figure,imshow(YIQ);
title('YIQ Image');