RGB image of size 500 x 500 pixels to a single array of size 250000.

Q. "Take a colored image of yourself consisting of RGB components of size 500x500 pixels. Read this image in Matlab and you will get the three channel components. Convert these three channels to a single array of size 250000"

What I am doing in this situation is, first i read the image than i split it into different R, G, B channel and then I m stuck in making the single array from those R, G, B channels.

My code is pasted below:

% Read an image (500 x 500 px) in MATLAB
rgbImage = imread('project.png'); 

% Extract the individial R, G and B Channel
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);

% Convert three channels to a single array of size 250000

Need help !!

Answer 1

[Image Analyst]

Use imsplit(), imresize(), and cat(3, r, g, b).

Answer 2

[Walter Roberson]

A = randi(9, 5, 5)

A = 5×5

9 9 3 2 9 7 6 4 3 8 2 5 9 7 2 3 3 3 2 9 1 7 3 5 3

●

reshape(A,25,1)

ans = 25×1

9 7 2 3 1 9 6 5 3 7

●

reshape(A,[],1)

ans = 25×1

9 7 2 3 1 9 6 5 3 7

●

A(:)

ans = 25×1

9 7 2 3 1 9 6 5 3 7

●

[Ahmed khalid]

Thanks for your reply.

But i getting confused is that it says in the ques that split the image into R, G, B channel and than make a single array.

Since these RGB Channels are a seperated 2D matrices. Total Qty matrices is 3 for each R, G and B. How to get a single array from all these three channels.

[Walter Roberson]

Convert each of the channels to an array that size.