[PDFBOX-2690] Implement write support for compressed object streams

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.8.8, 1.8.9, 2.0.0
• Component/s: Writing
• Environment: PDFBox 1.8.8, Java8u25, Windows 8.1
• Assignee: Unassigned
• Reporter: Brian Liu
• Created: 21/Feb/15 02:42
• Updated: 02/Dec/17 14:07

Description

I am using PDFBox 1.8.8 to manipulate existing PDF files. After saving a document, the output file becomes several times larger than the original. This is undesirable.

How to reproduce my problem:

In the following code, PDFBox simply loads an existing PDF and then save it. Nothing else is done. Yet the file size still becomes several times larger.

import java.io.*;
import org.apache.pdfbox.pdmodel.*;
import org.apache.pdfbox.exceptions.*;

class Test 
{
    public static void main(String[] args) throws IOException, COSVisitorException {

    PDDocument document = PDDocument.load("input2.pdf");
    document.save("input2-after-save.pdf");
    document.close();       
    }
}   

Attached are two sample PDF files. input2.pdf is an original, unprocessed PDF. input2-after-save.pdf is processed by the code above. After processing, file size increases from 416kB to 1.25MB.