java转换tiff图片格式成gif和jpg

从网上找了好久都没用找到用java转换tiff格式的图片，突然看到tiff转换成psd格式的，想能转成psd肯定能转成jpg和gif，先看了一下，原先需要其他的jar包，

我是从：http://www.java2s.com/ 网上下载的，

其中有：jai_codec-1.1.3.jar
jai_core.jar
jai_imageio-1.1.jar
iText-5.0.2.jar
下载完后添加到自己的Java项目中

代码 

需要引用

import java.awt.Color;
import java.awt.Graphics;

import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;



import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.stream.FileImageInputStream;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.spi.IIORegistry;
import javax.imageio.spi.ImageReaderSpi;

然后就是方法了

放到Main中

String tifPath="C:/1.tiff";
int pages=0;
        BufferedImage[] bi=null;
        File tiffFile = new File(tifPath);
        ImageReader tiffReader = null;
        ImageInputStream input = null;
        try {
            input = new FileImageInputStream(tiffFile);
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        IIORegistry iioreg = IIORegistry.getDefaultInstance();
        iioreg.registerApplicationClasspathSpis();
        ImageReaderSpi irs = new com.sun.media.imageioimpl.plugins.tiff.TIFFImageReaderSpi();
        try {
            tiffReader = irs.createReaderInstance();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        tiffReader.setInput(input);
        
        try {
            pages = tiffReader.getNumImages(true);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
        if(pages>0){
            bi=new BufferedImage[pages];
            for (int i = 0; i < pages; i++) {
                System.out.println(i);
                try {
                    bi[i]=tiffReader.read(i);
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                Image image = bi[i].getScaledInstance(bi[i].getWidth(), bi[i].getHeight(), Image.SCALE_DEFAULT);
                BufferedImage tag = new BufferedImage(bi[i].getWidth(), bi[i].getHeight(), BufferedImage.TYPE_INT_BGR);
                Graphics g = tag.getGraphics();
                g.drawImage(image, 0, 0, null);
                g.dispose();
                try {
                    ImageIO.write(tag, "GIF", new File("C:/"+i+"11.gif"));
                    ImageIO.write(tag, "JPG", new File("C:/"+i+"11.JPG"));
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }

这里要说明的是读出的图片流不能直接用
ImageIO.write方法进行输出图片，会报错，
最后自己想既然不能直接生成就用来图片的放大缩小，成功了！！

也不知道上面用的对不对，希望有人指出错误！！！