1: go to http://java.sun.com/products/java-media/jai/current.html

import java.io.FileOutputStream;
import java.io.OutputStream;

import javax.media.jai.JAI;
import javax.media.jai.RenderedOp;

import com.sun.media.jai.codec.BMPEncodeParam;
import com.sun.media.jai.codec.ImageCodec;
import com.sun.media.jai.codec.ImageEncoder;

/*
 * Created on 2004-8-22
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */

/**
 * @author Huang Jinxiang
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class Test {
    public static void main(String[] args) throws Exception{
        String inputFile = "me.tif";
        String outputFile = "out.bmp";
        RenderedOp src = JAI.create("fileload", inputFile);

        OutputStream os = new FileOutputStream(outputFile);
        BMPEncodeParam param = new BMPEncodeParam();
        ImageEncoder enc = ImageCodec.createImageEncoder("BMP", os,
                                                         param);
        enc.encode(src);
        os.close();
    }
}

 

for more details, you can go & check from :

http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/Encode.doc.html#47285

 

 

反过来你就可以把bmp转成tif的了...
只不过用不同的codec..

所以可以在bmp, jpg, png, tif之间相互转换....