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  • PS 滤镜— — sparkle 效果

        clc;
        clear all;
        close all;
    
        addpath('E:PhotoShop AlgortihmImage ProcessingPS Algorithm');
    
        I=imread('4.jpg');
        Image=double(I)/255;
    
        [height, width, depth]=size(Image);
    
        rays = 25;
        radius = 25;   
        amount = 25;     % 1-100
        color = [1.0, 1.0, 1.0];   % 0-1
        randomness = 25;
        centreX=width/2.0;
        centreY=height/2.0;
        % % seed = 371;
        rayLengths=radius+randomness / 100.0 * radius * rand(1,rays);
    
        Img_new=Image;
    
        for ii=1:height
            for jj=1:width
    
                dx = jj-centreX;
                dy = ii-centreY;
                distance=sqrt(dx*dx+dy*dy);
                angle = atan2(dy, dx);
                d = (angle+pi) / (2*pi) * rays;
                f=d-floor(d);
                len_1=rayLengths(mod(floor(d), rays)+1);
                len_2=rayLengths(mod(floor(d)+1, rays)+1);
                length = lerp(f, len_1,  len_2);
                g = length*length / (distance+0.0001);
                g = g.^((100-amount) / 50.0);
                f =f - 0.5;
        % %         f = 1-f*f;
                f =f * cos(g);
        % %         f =f * sin(g);
    
    
                f=min(max(0,f),1);
    
                r=Image(ii, jj, 1);
                g=Image(ii, jj, 2);
                b=Image(ii, jj, 3);
    
                Img_new(ii, jj, 1)=lerp(f, r, color(1));
                Img_new(ii, jj, 2)=lerp(f, g, color(2));
                Img_new(ii, jj, 3)=lerp(f, b, color(3));
    
    
            end
        end
    
        imshow(Img_new);
        imwrite(Img_new, 'out.jpg');

    参考来源:http://www.jhlabs.com/index.html

    原图:

    这里写图片描述

    效果图:

    这里写图片描述

    这里写图片描述

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  • 原文地址:https://www.cnblogs.com/mtcnn/p/9412562.html
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