Combining Color Images as one

Question

PenguinForce 2016-10-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/305416-combining-color-images-as-one

编辑： Jang geun Choi 2016-10-2

SO I have three separate green, blue, and red images. I want to display these three separate images as one combined image, while displaying them each individually as well, like in the picture below. However, my code is not working and only returns an error message instead. Could someone help me out? Thanks!

   Bimage = zeros(256, 256, 3, 'uint8');
Bimage(:, :, 3) = repmat(255:-1:0, 256, 1);
imagesc(Bimage)
Gimage = zeros(256, 256, 3, 'uint8');
Gimage(:, :, 2) = repmat(0:1:255, 256, 1);
imagesc(Gimage)
Rimage = zeros(256, 256, 3, 'uint8');
Rimage(:, :, 1) = repmat(0:1:255, 256, 1);
R2= imrotate(Rimage,90); %Rotate image by 90 degrees
imagesc(R2)
subplot(2,2,1), mesh(Bimage); title('Blue Image');
subplot(2,2,2), mesh(Gimage); title('Green Image');
subplot(2,2,3), mesh(R2); title('Red Image');
subplot(2,2,4), mesh(Bimage,Gimage,R2); title('Rainbow Image');

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Answer 1

Jang geun Choi 2016-10-2

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/305416-combining-color-images-as-one#answer_236977

在 MATLAB Online 中打开

    Bimage = zeros(256, 256, 1, 'uint8');
    Bimage(:, :, 3) = repmat(255:-1:0, 256, 1);
    Bimage=Bimage(:,:,3);
    imagesc(Bimage)
    Gimage = zeros(256, 256, 1, 'uint8');
    Gimage(:, :, 2) = repmat(0:1:255, 256, 1);
    Gimage=Gimage(:,:,2);
    imagesc(Gimage)
    Rimage = zeros(256, 256, 1, 'uint8');
    Rimage(:, :, 1) = repmat(0:1:255, 256, 1);
    R2=imrotate(Rimage,90); %Rotate image by 90 degrees
    R2=R2(:,:,1);
    imagesc(R2)
    subplot(2,2,1), imshow(Bimage); title('Blue Image');
    subplot(2,2,2), imshow(Gimage); title('Green Image');
    subplot(2,2,3), imshow(R2); title('Red Image');
    subplot(2,2,4), imshow(cat(3,Bimage,Gimage,R2)); title('Rainbow Image');

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Jang geun Choi 2016-10-2

在 MATLAB Online 中打开

To express amount of base color, two dimensional matrix is enough. In your code,

Bimage(:, :, 3) = repmat(255:-1:0, 256, 1);

This is used to express lack of blue as dark color.

And, cat function is used to merge matrix. Color image is considered as 3 dimensional matrix, image(x,y,c), in matlab. x and y are spatial coordinate, c is each base color.

image_data=cat(3,R2,Gimage,Bimage);
imshow(image_data)

Like this, we can stack base color matrix using cat function.

Sorry, my english is not good.

Jang geun Choi 2016-10-2

编辑：Jang geun Choi 2016-10-2

在 MATLAB Online 中打开

Yes, you can. You already use rotation in red color matrix using function "imrotate"

    Gimage = zeros(256, 256, 1, 'uint8');
    Gimage(:, :, 2) = repmat(0:1:255, 256, 1);
    Gimage=Gimage(:,:,2);
    Gimage=imrotate(Gimage,-90);
    imagesc(Gimage)

Change code like this.

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Answer 2

Image Analyst 2016-10-2

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/305416-combining-color-images-as-one#answer_236979

在 MATLAB Online 中打开

Try this:

workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;
greenImage = uint8(repmat(0:255, 256, 1));
redImage = imrotate(greenImage, 90);
blueImage = imrotate(greenImage, 180);
subplot(2, 2, 1);
imshow(redImage);
title('Red Image', 'FontSize', fontSize);
subplot(2, 2, 2);
imshow(greenImage);
title('Green Image', 'FontSize', fontSize);
subplot(2, 2, 3);
imshow(blueImage);
title('Blue Image', 'FontSize', fontSize);
% Recombine separate color channels into a single, true color RGB image.
rgbImage = cat(3, redImage, greenImage, blueImage);
subplot(2, 2, 4);
imshow(rgbImage);
title('Color Image', 'FontSize', fontSize);