Adjusting the size of images

My function needs to adjust images that are either larger or smaller than 255 x 255 to be 255 x 255. Here is the code I have so far but it doesn't.

function [outImage] = adjust_img(img)
 %cast to double
 img = double(img);
  %make variables row and col the size of the img
 [row,col,n] = size(img);
  outImage = img;
     %for loops to loop through each row, column, and layer
     for i = 1:row
          for j = 1:col
              %if img is greater than 255 to equal 255
               if  img(i,j,:) > 255
                        img(i,:) = 255;
               end
              %if img is less than 0 to equal 0
               if img(i,j,:) < 0
                        img(i,j,:) = 0;
               end   
          end
     end
      outImage = img(i,j,k);
end

Answer 1

[Star Strider]

I’m having problems following your code, since I can’t tell if you want each pixel to be limited to (0,255) or if you want the image size itself to be a matrix of (255x255).

If you want the range of values limited, this works:

ImD = 100 + 100*randn(10);                                          % Create Matrix
ImL = (ImD < 0)*0;                                                  % Set Elements < 0 = 0
ImH = (ImD > 255)*255;                                              % Set Elements > 255 = 255
ImC = (ImD >=0 ) & (ImD <= 255);                                    % All Other Elements
Im2 = ImL + ImH + ImC.*ImD;                                         % Add Matrices To Create Result

If you want the matrix size limited to (255x255), use the imresize function.