Grayscale of RGB channels

Is it possible to convert the matrix values of R, G and B channels to its own grayscale values respectively?

[Geoff Hayes]

Sneha - please clarify what you mean by ...R, G, and B channels to its own grayscale values respectively.

[SNEHA P S]

Am not sure that whether the R G and B matrices itself display grayscales ?

[Adam]

Each of the R, G and B channels can already be considered greyscale by itself. Whether it is useful to do so or not is another matter, but you haven't given any information so it's impossible to say.

Answer 1

[Jan]

RGB = rand(100, 100, 3);   % RGB array
R   = RGB(:, :, 1);        % Gray image of the red channel
G   = RGB(:, :, 2);        % Gray image of the green channel
B   = RGB(:, :, 3);        % Gray image of the blue channel

figure
image(R)
figure
image(cat(3, R, R, R))