Kshitij Singh answered . 2024-05-18 05:48:29

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);

each one of those arrays is just a simple monochrome gray scale array, and will appear as gray scale if you use imshow(). If you want to see it appear in the color of the color channel that it represents then you'd have to either use cat() to make an RGB image out of it:

z = zeros(size(redChannel));
redAppearingImage = cat(3, redChannel, z, z);
imshow(redAppearingImage);

or use colormap() to apply a color to it (which will use less memory)

imshow(redChannel);
myColorMap = [[0:255]', zeros(256,1), zeros(256,1)];
colormap(myColorMap);
colorbar;

Finally you might have fun running my RGB histogram demo attached below.

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