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how to form the final image from red green and blue channels

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Abira Banik
Abira Banik 2015-3-31
关闭： MATLAB Answer Bot 2021-8-20
i have extracted the red green and blue channels from the image and had done different operations on it. now i want to form the final image from the different channels of the original image.

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Christiaan
Christiaan 2015-4-1
编辑：Christiaan 2015-4-1
Dear Abira,
You can contract the channels by using the MATLAB function cat.
Below you find a small example how this can be implemented.
% Read any image you like
rgbImage = imread('board.jpg');
% Display this image
subplot(1, 2, 1);
imshow(rgbImage);
title('Original RGB Image');
% Maximize figure
set(gcf, 'Position', get(0, 'ScreenSize'));
% Split into color bands.
redBand = rgbImage(:,:, 1);
greenBand = rgbImage(:,:, 2);
blueBand = rgbImage(:,:, 3);
% Display image after contracting the colour bands again
subplot(1, 2, 2);
im = cat(3,redBand,greenBand,blueBand);
imshow(im);
title('Blue Objects');
Good luck! Christiaan

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