Java將出片處理成老照片特效代碼

PS中有一種濾鏡可以讓圖像看上去好像歷經歲月，微微泛黃 英文中這種圖像特效被稱為Sepia Tone Effect 直譯過來的意思

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));

</pre> 

 2. 對圖像計算出來的新的RGB值根據隨機權重與舊值混合。 

 計算隨機權重的代碼如下： 


private double noise() {

    return Math.random()*0.5 + 0.5;

}

</pre> 混合顏色的代碼如下：
private double colorBlend(double scale, double dest, double src) {

    return (scale  dest + (1.0 - scale)  src);

}

</pre> 濾鏡完全源代碼：
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";  
}  


}  </pre>