Java将出片处理成老照片特效代码详解编程语言

PS中有一种滤镜可以让图像看上去好像历经岁月，微微泛黄 英文中这种图像特效被称为Sepia Tone Effect 直译过来的意思

int fr= (int)(((double)tr * 0.393) + ((double)tg * 0.769) + ((double)tb * 0.189));   
int fg = (int)(((double)tr * 0.349) + ((double)tg * 0.686) + ((double)tb * 0.168));    
int fb= (int)(((double)tr * 0.272) + ((double)tg * 0.534) + ((double)tb * 0.131));   
 

2. 对图像计算出来的新的RGB值根据随机权重与旧值混合。

计算随机权重的代码如下：

 
private double noise() {   
    return Math.random()*0.5 + 0.5;   
}   
 

混合颜色的代码如下：

 
private double colorBlend(double scale, double dest, double src) {   
    return (scale * dest + (1.0 - scale) * src);   
}   
 
 
 

滤镜完全源代码：

 
package com.gloomyfish.filter.study;   
   
import java.awt.image.BufferedImage;   
   
public class SepiaToneFilter extends AbstractBufferedImageOp {   
   
    @Override   
    public BufferedImage filter(BufferedImage src, BufferedImage dest) {   
        int width = src.getWidth();   
        int height = src.getHeight();   
   
        if ( dest == null )   
            dest = createCompatibleDestImage( src, null );   
   
        int[] inPixels = new int[width*height];   
        int[] outPixels = new int[width*height];   
        getRGB( src, 0, 0, width, height, inPixels );   
        int index = 0;   
        for(int row=0; row<height; row++) {   
            int ta = 0, tr = 0, tg = 0, tb = 0;   
            for(int col=0; col<width; col++) {   
                index = row * width + col;   
                ta = (inPixels[index] >> 24) & 0xff;   
                tr = (inPixels[index] >> 16) & 0xff;   
                tg = (inPixels[index] >> 8) & 0xff;   
                tb = inPixels[index] & 0xff;   
   
//int fr= (int)(((double)tr * 0.393) + ((double)tg * 0.769) + ((double)tb * 0.189));   
//int fg = (int)(((double)tr * 0.349) + ((double)tg * 0.686) + ((double)tb * 0.168));    
//int fb= (int)(((double)tr * 0.272) + ((double)tg * 0.534) + ((double)tb * 0.131));   
                   
                int fr = (int)colorBlend(noise(), (tr * 0.393) + (tg * 0.769) + (tb * 0.189), tr);   
                int fg = (int)colorBlend(noise(), (tr * 0.349) + (tg * 0.686) + (tb * 0.168), tg);   
                int fb = (int)colorBlend(noise(), (tr * 0.272) + (tg * 0.534) + (tb * 0.131), tb);   
                   
                outPixels[index] = (ta << 24) | (clamp(fr) << 16) | (clamp(fg) << 8) | clamp(fb);   
                   
            }   
        }   
        setRGB( dest, 0, 0, width, height, outPixels );   
        return dest;   
    }   
       
    private double noise() {   
        return Math.random()*0.5 + 0.5;   
    }   
       
    private double colorBlend(double scale, double dest, double src) {   
        return (scale * dest + (1.0 - scale) * src);   
    }   
       
    public static int clamp(int c)   
    {   
        return c > 255 ? 255 :( (c < 0) ? 0: c);   
    }   
       
    public String toString()   
    {   
        return "Sepia Tone Effect - Effect from Photoshop App";   
    }   
   
}