How to separate an image to rgb?

how to divide an image into its r,g,and b colour planes,

Answer 1

[Image Analyst]

No reshaping is needed. Simply extract the color channels you need:

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

Then, to reverse the process and create an RGB image from three separate color channels:

% Recombine separate color channels into a single, true color RGB image.
rgbImage = cat(3, redChannel, greenChannel, blueChannel);

[nur liyana zamri]

This code didnt work

[Walter Roberson]

This code would definitely work if you have an RGB image stored in a variable named rgbImage .

It is possible, however, that this is not what you want done. What you might want done might be

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

z = zeros(size(rgbImage), class(rgbImage));
redImage = z; redImage(:,:,1) = redChannel;
greenImage = z; greenImage(:,:,2) = greenChannel;
blueImage = z; blueImage(:,:,3) = blueChannel;

subplot(2,2,1); image(rgbImage);
subplot(2,2,2); image(redImage);
subplot(2,2,3); image(greenImage);
subplot(2,2,4); image(blueImage);

[atersaw tigyhun]

hahaha too long

Answer 2

[Sailesh Sidhwani]

Starting R2018b, Image Processing Toolbox has a new function "imsplit" which does exactly this: https://www.mathworks.com/help/images/ref/imsplit.html

Answer 3

[ES]

I=imread('image.jpg')

will give I (a 3d array, of size [x,y,3] )where x and y are the dimensions of the image. 3 is for R, G, and B components.

To separate out the three components, you can do a

R = reshape(I(:,:,1),[],1);
G = reshape(I(:,:,2),[],1);
B = reshape(I(:,:,3),[],1);

Answer 4

[Negesse Tadesse]

how about imsplit function?

[R G B] = imsplit(myImage);