>> a=imread('D:\ebook\lena.bmp');
>> b=imread('D:\ebook\2009.bmp');
>> a1=a(:,:,1);
>> a2=a(:,:,2);
>> a3=a(:,:,3);
>> b1=b(:,:,1);
>> b2=b(:,:,2);
>> b3=b(:,:,3);
>> c(:,:,1)=imadd(a1,b1,'uint16');
c(:,:,2)=imadd(a2,b2,'uint16');
c(:,:,3)=imadd(a3,b3,'uint16');
>> figure,imshow(uint8(c));