The MATLAB function imread can import image files as variables in the workspace. The exact format of the image matrix in the MATLAB workspace depends on its encoding. For the most common situation of a RGB-encoded image, the function "A = imread(filename, fmt)" will return A, a x-by-y-by-3 matrix where x and y are the number of pixels in the height and width dimensions, and the 3rd dimension contains the Red, Green and Blue values for each given pixel.

Have a look at the MATLAB documentation for imread: http://www.mathworks.com/help/matlab/ref/imread.html

See also "Displaying Bit-Mapped Images" in the MATLAB documentation.

Hope this helps.

The MATLAB function imread can import image files as variables in the workspace. The exact format of the image matrix in the MATLAB workspace depends on its encoding. For the most common situation of a RGB-encoded image, the function "A = imread(filename, fmt)" will return A, a x-by-y-by-3 matrix where x and y are the number of pixels in the height and width dimensions, and the 3rd dimension contains the Red, Green and Blue values for each given pixel.

Have a look at the MATLAB documentation for imread: http://www.mathworks.com/help/matlab/ref/imread.html

See also "Displaying Bit-Mapped Images" in the MATLAB documentation.

Hope this helps.

If you are using MATLAB, then the answer given Prof. Pierre Megevand is Good and enough. If you prefer C/C++ then please see the following libraries

GdiPlus(C++), CxImage(C++), CImg, Boost's GIL, libjpeg, Magick++ API

Please also see

http://www.imagemagick.org/Magick++/Image.html

imread()

Matlab code:

x = imread('lana.bmp'); % Choose the color image

r = x(:,:,1); % Get the RED matrix

g = x(:,:,2); % Get the GREEN matrix

b = x(:,:,3); % Get the BLUE matrix

% Display

%Red component

subplot(1,3,1);image(r), colormap([[0:1/255:1]', zeros(256,1), zeros(256,1)]), colorbar;

%Green Component

subplot(1,3,2);image(g), colormap([zeros(256,1),[0:1/255:1]', zeros(256,1)]), colorbar;

%Blue component

subplot(1,3,3);image(b), colormap([zeros(256,1), zeros(256,1), [0:1/255:1]']), colorbar;

You must take into account the format of the image file. If your image has several bands you need to know if the file is BSQ, BIL or BIP.

http://www.jars1974.net/pdf/07_Chapter06.pdf

Also you need to know if your image is a 8-bit/band images or 16 bit/band.

RGB = imread('your image path');

R = RGB(:, :, 1);

G = RGB(:, :, 2);

B = RGB(:, :, 3);

imshow(R);

imshow(G);

imshow(B);

in R:

library(imager)

im