compl.m

Index to gray conversion in matlab

close all  %closes all windows
clear all  %clears all variables from workspace 
clc        %clear command window

f=zeros(10,10);   %10x10 matrix of zeros
f(3:6,3:6)=1;     %Asiign 1 in  3:6 location

comp=imcomplement(f);

subplot(2,2,1),imshow(f),title('Original image')
subplot(2,2,2),imshow(comp),title('Complemented image')