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
clear all;
close all;
[FileName,PathName] = uigetfile('*.jpg','Open an Image File');
img = imread([PathName FileName]);
figure, imshow(img);
img = double(img);
Rimg = img(:,:,1);
Gimg = img(:,:,2);
Bimg = img(:,:,3);
[x ,y] = size(Rimg);
Rimg0 = 0.393 * Rimg + 0.769 * Gimg + 0.189 * Bimg;
Gimg0 = 0.349 * Rimg + 0.686 * Gimg + 0.168 * Bimg;
Bimg0 = 0.272 * Rimg + 0.534 * Gimg + 0.131 * Bimg;
for i = 1 : x
    for j = 1 : y
        if(Rimg0(i, j)>255)
            Rimg0(i, j) = 255;
        end
        if(Gimg0(i, j)>255)
            Gimg0(i, j) = 255;
        end
        if(Bimg0(i, j)>255)
            Bimg0(i, j) = 255;
        end
    end
end
img(:, :, 1) = Rimg0;
img(:, :, 2) = Gimg0;
img(:, :, 3) = Bimg0;
figure, imshow(uint8(img));