Repairing pixelated image using matlab Help needed

Hi I need help repairing this image using for loops. I know I have to identify the bad pixels first and fill them in. thanks. PS I am very new to matlab

Im pretty sure the for statemetn is wrong and I do not know wat to do from here. I need help writing the for loop to go through the image matrix to identify the black and white pixels.

 clear
 clc
 format compact

 filenameIN = uigetfile('.bmp','Picture');
 noisyRGBarray = imread(filenameIN);
 figure(1)
 imshow(noisyRGBarray)
 y = noisyRGBarray;
 [m,n]=size(y)
 clean=[];

 for i=2:m-1
   for j=2:n-1
       if y(i,j)% clean add new
            clean = [ clean, y(i,j) ]
       end
   end
end

% code end

Answer 1

[Image Analyst]

See my salt and pepper noise removal program, attached.