Operation on RGB Images

I have applied the security algo on Grayscale images which were converted to Grayscale from RGB.Now if want to operation directly on RGB image How can I separate the R,G & B components & merge at the end.

Thanks

Answer 1

[Pugazhendhi]

The following steps will help you split RGB and merge them again.

I = imread('RGB.jpg');
%RGB split
R=I(:,:,1);
G=I(:,:,2);
B=I(:,:,3);

%merge RGB channels

RGB1=cat(3,R,G,B);

Answer 2

[Sukuchha]

read your image with imread and extract RGB with indexing.

I= imread('your_pic')
R = I(:,:,1);
G = I(:,:,2);
B= I(:,:,3);