How do I split a color image into its 3 RGB channels?

Illustration
krastinedekart - 2022-07-01T09:45:53+00:00
Question: How do I split a color image into its 3 RGB channels?

Hi, How can I split a color image into its 3 RGB channels, like in this link: http://www.originlab.com/www/products/images/ChannelSplit_Merge.png ( Image link ) 

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    • Expert Answer

    Profile picture of John Williams John Williams answered . 2025-11-20

    For this you an follow this code :

    % Read in original RGB image.
    rgbImage = imread('flower.webp');
     
    % Extract color channels.
    redChannel = rgbImage(:,:,1); % Red channel
    greenChannel = rgbImage(:,:,2); % Green channel
    blueChannel = rgbImage(:,:,3); % Blue channel
    % Create an all black channel.
    allBlack = zeros(size(rgbImage, 1), size(rgbImage, 2), 'uint8');
     
    % Create color versions of the individual color channels.
    just_red = cat(3, redChannel, allBlack, allBlack);
    just_green = cat(3, allBlack, greenChannel, allBlack);
    just_blue = cat(3, allBlack, allBlack, blueChannel);
     
    % Recombine the individual color channels to create the original RGB image again.
    recombinedRGBImage = cat(3, redChannel, greenChannel, blueChannel);
     
    % Display them all.
    subplot(3, 3, 2);
    imshow(rgbImage);
    fontSize = 20;
    title('Original RGB Image', 'FontSize', fontSize)
    subplot(3, 3, 4);
    imshow(just_red);
    title('Red Channel in Red', 'FontSize', fontSize)
    subplot(3, 3, 5);
    imshow(just_green)
    title('Green Channel in Green', 'FontSize', fontSize)
    subplot(3, 3, 6);
    imshow(just_blue);
    title('Blue Channel in Blue', 'FontSize', fontSize)
    subplot(3, 3, 8);
    imshow(recombinedRGBImage);
    title('Recombined to Form Original RGB Image Again', 'FontSize', fontSize)
     
    set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')


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