import java.awt.image.RenderedImage;
import java.awt.image.renderable.ParameterBlock;
import java.io.File;
import java.io.IOException;
import javax.media.jai.JAI;

public class Test {
    public static void tifToPng(String otPath) throws IOException {
        File tiff = new File(otPath);
        if (null != tiff && tiff.exists()) {
            String fileNameIgnore = tiff.getName().replaceAll("[.][^.]+$", "");
            TIFFDecodeParam param0 = null;
            TIFFEncodeParam param = new TIFFEncodeParam();
            JPEGEncodeParam param1 = new JPEGEncodeParam();
            ImageDecoder dec = ImageCodec.createImageDecoder("tiff", tif, param0);
            int count = dec.getNumPages();
            System.out.println("count:{}"+ count);
            param.setCompression(TIFFEncodeParam.COMPRESSION_GROUP4);
            param.setLittleEndian(false);
            for (int i = 0; i < count; i++) {
                RenderedImage page = dec.decodeAsRenderedImage(i);
                //设置转换后的png图片存储路径
                StringBuffer pngPath = new StringBuffer(tiff.getParent()).append(File.separator).append(fileNameIgnore);
                if (count > 1) {
                    pngPath.append("(").append(++i).append(")");     
                }
                pngPath.append(".png");                                 //png格式
                File pngFile = new File(pngPath.toString());
                ParameterBlock pb = new ParameterBlock();
                pb.addSource(page);
                pb.add(pngFile.toString());
                pb.add("JPEG");
                pb.add(param1);
                JAI.create("filestore", pb);
            }
        }
    }

    public static void main(String[] args) throws IOException {
        tifToPng("/Users/xiayangyang/Downloads/tiff/f43a8585-3cf2-4cbb-9150-fb93c10e4f21image1.tiff");
    }
}