怀旧风格照片特效

 我想说怀旧风格的效果很容易实现，就那么几句话，也没啥可说的。
 1 % 怀旧风格滤镜
 2 clear all;
 3 close all;
 4 [FileName,PathName] = uigetfile('*.jpg','Open an Image File');
 5 img = imread([PathName FileName]);
 6 figure, imshow(img);
 7 img = double(img);
 8 Rimg = img(:,:,1);
 9 Gimg = img(:,:,2);
10 Bimg = img(:,:,3);
11 [x ,y] = size(Rimg);
12 Rimg0 = 0.393 * Rimg + 0.769 * Gimg + 0.189 * Bimg;
13 Gimg0 = 0.349 * Rimg + 0.686 * Gimg + 0.168 * Bimg;
14 Bimg0 = 0.272 * Rimg + 0.534 * Gimg + 0.131 * Bimg;
15 for i = 1 : x
16     for j = 1 : y
17         if(Rimg0(i, j)>255)
18             Rimg0(i, j) = 255;
19         end
20         if(Gimg0(i, j)>255)
21             Gimg0(i, j) = 255;
22         end
23         if(Bimg0(i, j)>255)
24             Bimg0(i, j) = 255;
25         end
26     end
27 end
28 img(:, :, 1) = Rimg0;
29 img(:, :, 2) = Gimg0;
30 img(:, :, 3) = Bimg0;
31 figure, imshow(uint8(img));