关于图片合成缩放的问题（附源码）

以下是一个图片合成的代码，可是合成后，图片有点轻微失真，图片的大小有点变小（……k），望高手指教，如何能避免失真，使图片质量提高 p.v 8aN+^  
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import com.sun.image.codec.jpeg.JPEGImageEncoder; K)1'G!A O  
import java.io.IOException; QP<=T5T  
import com.sun.image.codec.jpeg.JPEGEncodeParam; ?6j{~yN  
import javax.imageio.ImageIO; qzCP! 9  
import java.awt.AlphaComposite; JE9lj+KdJ  
import java.io.File; IqBbL<R}  
import java.awt.Graphics2D; Ng F-1}.  
import com.sun.image.codec.jpeg.JPEGCodec; }4t] 80F H  
import java.io.FileOutputStream; X WF; kk  
import java.awt.image.BufferedImage; l=u  
import java.awt.Graphics; TMJu<x$r@  
import javax.imageio.stream.FileImageInputStream; >mCX6  
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public class twoinone20070703 { S3 oP1GS  
  public twoinone20070703() { G! SILz,  
  } q}8D/ART  
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  public static void ImgCompose(String ImgBotton, String ImgTop, %NdGC*3t^u  
                                String ImgProduct, int width, int height) { Y
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    BufferedImage bi1 = null; _|"gdH9b  
    int x = width; <{Rd$;~C  
    int y = height; 3lIIPr  
    BufferedImage bi2 = null; 1O=<~`4?  
    try { c2Kkn)z<  
// FileImageInputStream temp = new FileImageInputStream(ImgBotton); m&UaH n  
      //javax.imageio.ImageIO.ImageInputStream lwB*%p   
      bi1 = javax.imageio.ImageIO.read(new  FileImageInputStream (new File(ImgBotton))); (K-j7!K^  
      // bi1 = javax.imageio.ImageIO.read(new ImageInputStream(ImgBotton)); !n Upjo4Ti  
      bi2 = javax.imageio.ImageIO.read(new  FileImageInputStream (new File(ImgTop))); ?5`04Ve&  
    } 4(CWe,OMG  
    catch (IOException e) { xl1HQI5  
      e.printStackTrace(); "9b@X=  
    } ^ Io?O  
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    /*try { 3Acu_*%2  
// FileImageInputStream temp = new FileImageInputStream(ImgBotton); Yn4k~lh  
      //javax.imageio.ImageIO.ImageInputStream zD#yn -s  
    bi1 = javax.imageio.ImageIO.read(new File(ImgBotton)); io);5! 4h  
// bi1 = javax.imageio.ImageIO.read(new ImageInputStream(ImgBotton)); ? {8IFjfM  
    bi2 = javax.imageio.ImageIO.read(new File(ImgTop)); ^b~~u  
    } catch (IOException e) { 
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    e.printStackTrace(); VzL!jb g  
    }*/ `}C&S  
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    Graphics g = bi1.getGraphics(); G1-u'+|  
    //g.getColor(); a. uJJwp  
    g.setColor(g.getColor()); P voGwe(5  
    g.drawImage(bi2, x, y, null); x~ EC=]L  
    FileOutputStream out = null; //输出到文件流 n}dG) 1  

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    try { n_uzV  
      out = new FileOutputStream(ImgProduct); &}N;O*}  
      JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); 1&NCI*\,  
      JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi1); xm?`8{rcF)  
      param.setQuality(1, false); //不压缩图像fals [KP5i/8  
      encoder.setJPEGEncodeParam(param); /p*~#$e97  
      encoder.encode(bi1); kn}+D\0UU  
      out.flush(); <" v5(JD5  
      out.close(); `oB%)D +  
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    } N'7H~C5P  
    catch (IOException e) { T%!hr Lg#  
      e.printStackTrace(); //合并图 96c&(y  
    } q,|^XNNSr  
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    /* Uz;lXdgG  
    　　p1背景图，p2印章，p为输出图。p2要是gif或png等支持透明图象的。 &5goQq[  
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    　　x,y 为在背景图放置印章的坐标（ 左上角开始算）。 &jxs_F  
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    　　在Java2D中设置画图的透明度： 3%k6Z( M  
    */ ~[PL^:N0  
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  float alpha = 0.0001f; // 透明度 K7[n:;B  
    try { |dX!s>f  
      BufferedImage bufferedImage = ImageIO.read(new File(ImgProduct)); ?By3i+M
 
      Graphics2D g2d = bufferedImage.createGraphics();  R*x!58  
      // 设置透明 Ql@ogP4b  
      g2d.setComposite(AlphaComposite.getInstance( s5#5 0{5Z  
          AlphaComposite.SRC_ATOP, alpha)); // 开始 y"% sAnt&  
          //g2d.drawImage(); // 画图 N#/Iq^3: 8  
      g2d.drawImage(bi2, x, y, null); O+*GY  
      g2d.setComposite(AlphaComposite.getInstance( (,paD
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          AlphaComposite.SRC_OVER)); // 结束 *PL2*"  
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    } C
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    catch (Exception e) { g-o O {  
      System.out.println("error of ImgCompose"); .L=G#r  
    } l0(v34G  
  } !hVx3=3  
  public  static  void  main(String[]  args)  throws  IOException  { 4 LD*3  
  twoinone20070703 temp = new twoinone20070703(); 'Q-k.Uq~  
  temp.ImgCompose("e:\\img\\2.jpg","e:\\img\\57.jpg","e:\\img\\3.jpg",0,0); Az`;(W_?G`  
  } &;VBHIhJ  
}