How to compress a pdf file in java?

Question

I have a program which will convert a Tiff image(900kb) to a PDF File(250-300KB), I want the pdf file to be compressed least(80-100KB) , inorder to transmit the file to the server and save it there,
I have tried using java.util.zip outputStreams its not doing so,
Why it is?
Or Give a alternate Solution for it?
Or Is there any free software that do it for me?
Please do suggest !

Answer 1

This is my code where I am passing a .tiff file and getting the .pdf file as output.
Now I want to reduce the output PDF File size.
public void convertTiff2PDf(String tiff_file)
               String      pdf_file = tiff_file.substring(0, tiff_file.lastIndexOf(".") + 1) + "pdf";
               Document document = new Document();
               try
                    PdfWriter writer = PdfWriter.getInstance(document,
                              new FileOutputStream(pdf_file));
                    int pages = 0;
                    document.open();
                    PdfContentByte cb = writer.getDirectContent();
RandomAccessFileOrArray ra = null;
int comps = 0;
try {
ra = new RandomAccessFileOrArray(tiff_file);
comps = TiffImage.getNumberOfPages(ra);
catch (Throwable e) {
System.out.println("Exception in " + tiff_file + " " + e.getMessage());
for (int c = 0; c < comps; ++c) {
try {
Image img = TiffImage.getTiffImage(ra, c + 1);
if (img != null) {
System.out.println("page " + (c + 1));
if (img.scaledWidth() > 500 || img.scaledHeight() > 700) {
img.scaleToFit(800, 850);
img.setAbsolutePosition(20, 20);
// document.add(new Paragraph(tiff_file + " - page " + (c + 1)));
cb.addImage(img);
document.newPage();
++pages;
catch (Throwable e) {
System.out.println("Exception " + tiff_file + " page " + (c + 1) + " " + e.getMessage());
                    ra.close();
                    document.close();
               } catch (Throwable e) {
                    e.printStackTrace();
     }