how i can convert a matrix in to a column vector and again i need to convert that column vector in to matrix form without disturbing the original pixels position

i have an image in double format ,bnad 1 (:,:,1) , band2(:,:,2), 1. how can i convert image matrix in vector form 2. how i can reshape the converted vector in orignal matrix form, bithout disturbing the poxelx positions.

Answer 1

[Jan]

RGB = rand(640, 480, 3);
R   = RGB(:, :, 1);
G   = RGB(:, :, 2);
B   = RGB(:, :, 3);

Rv = R(:);            % Vectors for each channel
Gv = G(:);
Bv = B(:);

RGBv = [Rv; Gv; Bv];  % All as 1 vecor

Out = reshape(RGBv, 640, 480, 3);  % Restore original immage:
isequal(RGB, Out)     % Success:    

ans = logical
   1