MATLAB: How can we generate an image with equal number of intensity values

Question

For example we have an image that has 5 pixels with intensity 100, 5 with intensity 50, 5 with intensity 200 and so on.

Answer 1

   needHeight = 96;   needWidth = 78;   %adjust as required
   default_pix_intens = 0;   %default intensity if the template does not describe enough pixels
   template = [5, 100;       %count, intensity
              5, 50;
              5, 200];
   num_pix_needed = needHeight * needWidth;
   pixdata = [];
   for K = 1 : size(template,1)
      pixdata = [pixdata, repmat(template(K,2), 1, template(K,1))];
   end
   num_pix_templated = length(pixdata);
   if num_pix_templated > num_pix_needed
     error( fprintf('only %d total pixels needed but template describes %d pixels', num_pix_needed, num_pix_templated) );
   elseif num_pix_templated < num_pix_needed
     pixdata(num_pix_templated+1 : num_pix_needed) = default_pix_intens;
   end
   scrambled_pixdata = pixdata(randperm(numel(pixdata)));  %assuming you want a random order
   pix_matrix = reshape(scrambled_pixdata, needHeight, needWidth);