Add second year

second/semester2/CT248/Assignments/Assignment-04/pic2grayscale.m

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+function [returnImg] = pic2grayscale(img) 
+% which uses the NTSC Standard transformation to convert RGB to grayscale. 
+    %0.2989 * R + 0.5870 * G + 0.1140 * B
+
+    % img to be returned
+    returnImg = zeros(size(img,1), size(img, 2)); 
+
+    % looping through the RGB image and calculating the grayscale value for
+    % each pixel in the corresponding returnImg
+    for i = 1:size(img,1) 
+        for j = 1:size(img,2)
+            returnImg(i,j) = (0.2989 * img(i,j,1)) + (0.5870 * img(i,j,2)) + (0.1140 * img(i,j,3));
+        end 
+    end
+    
+    returnImg = uint8(returnImg);
+end