combining RGB to get a full image

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Recombine separate color channels into an RGB image.
rgbImage = cat(3, redChannel, greenChannel, blueChannel);

I call them "channels" because that is the terminology Photoshop uses. You have to change the name of the arrays from redChannel to what yours are called. After you split apart your color channels and reprocessed them you have final_red. This, NOT redChannel, is what you need to use. You also need to not change from dimension 3 (which I had) to dimension 2. So the final code would be

    % Recombine separate color channels into an RGB image.
    rgbImage = cat(3, final_red,final_green,final_blue);

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Chrissie Nyssen 2019-7-1

编辑：Chrissie Nyssen 2019-7-1

It's a 3D image if you are layering the R G B images on top of each other -

imgRGB = cat(3, R, G, B)

imshow (imgRGB)

Srivatsan N 2020-7-21

Is there any way to transform the grayscale image to rgb image?

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Wayne King 2011-10-23

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Hi, You don't want to concatenate along the column dimension. An RGB image has 3 dimensions. You want to concatenate along the 3rd dimension.

      imdata = imread('ngc6543a.jpg');
      RC = imdata(:,:,1);
      GC = imdata(:,:,2);
      BC = imdata(:,:,3);
      im = cat(3,RC,GC,BC);
      isequal(imdata,im)
      imshow(im)

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prem preet 2011-10-23

??? Undefined function or variable 'redchannel'.

prem preet 2011-10-23

this error occured for all 3 above functions ....

imshow(redchannel);.....

plss rply fast..

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tablo tofiq 2016-5-6

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编辑：Stephen23 2016-5-6

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display image in three color red&green&blue

a=imread('autumn.tif');
a1=a;
a1(:,:,2)=0;
a1(:,:,3)=0;
subplot(3,1,1)
imshow(a1)
a2=a;
a2(:,:,1)=0;
a2(:,:,3)=0;
subplot(3,1,2)
imshow(a2)
a3=a;
a3(:,:,1)=0;
a3(:,:,2)=0;
subplot(3,1,3)
imshow(a3)

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Stephen23 2016-5-6

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Without three intermediate variables:

b = imread('autumn.tif');
b(:,:,4) = 0;
subplot(3,1,1)
imshow(b(:,:,[1,4,4]))
subplot(3,1,2)
imshow(b(:,:,[4,2,4]))
subplot(3,1,3)
imshow(b(:,:,[4,4,3]))