save the RGB numbers of an image inside a cell

 Hi. I would like to save the RGB numbers of an image (see RGB_value) inside a cell (see matrix) that has the same size as the image and in the same determined position.

 

For example: in the code below I have taken the values X=71 and Y=35 to which correspond RGB_value = [244 244 244]. I should save this RGB_value inside a 'matrix' cell at position X=71 and Y=35.

 

I should then apply the same argument for all other RGB_values for X=1:col_imageArray and Y=1:row_imageArray.

 

At the moment I was only able to determine RGB_value of one pixel but I can't insert this value inside the cell at the desired position.

 

imageArray = importdata("ssg.jpg");
figure()
imshow(imageArray)
impixelinfo

row_imageArray = height(imageArray);
col_imageArray = width(imageArray);

matrix = {};

X = 71;
Y = 35;

RED = imageArray(Y,X,1);
GREEN = imageArray(Y,X,2);
BLUE = imageArray(Y,X,3);

RGB_value = [RED, GREEN, BLUE];

matrix = [matrix,{RGB_value}];

 NOTE:-

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I know you said you want a cell but I think you really don't want a slow, inefficient, memory hogging cell array. I think you should use just a regular, fast and efficient double matrix. Frankly I'm not even sure why you think you want a matrix of all the pixel locations and their RGB values. Unless it's your homework which seems probable. Anyway, here is a full, extremely well commented demo to do that:

 

 

% Take an RGB Image and write all the pixel info to a csv file in the form [R, G, B, X, Y].
% It will have as many rows as pixels in the image, and have those 5 columns.
% Initialization steps.
clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;

%----------------------------------------------------------------------------------------------------------
% Have user browse for a file, from a specified "starting folder."
% For convenience in browsing, set a starting folder from which to browse.
startingFolder = pwd; % or 'C:\wherever';
if ~isfolder(startingFolder)
    % If that folder doesn't exist, just start in the current folder.
    startingFolder = pwd;
end
% Get the name of the file that the user wants to use.
defaultFileName = fullfile(startingFolder, '*.*');
[baseFileName, folder] = uigetfile(defaultFileName, 'Select an RGB image file');
if baseFileName == 0
    % User clicked the Cancel button.
    return;
end
fullFileName = fullfile(folder, baseFileName)

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