This was just discussed earlier in this list.

The importer does NOT respect Optional Content Groups (aka "layers").  You 
would need to write a bunch of code inside of iText to deal with them - either 
bringing them over or stripping them out.

Leonard

-----Original Message-----
From: Segev, Eli [mailto:[email protected]] 
Sent: Tuesday, July 13, 2010 4:38 PM
To: Post all your questions about iText here
Subject: [iText-questions] Showing Invisible Layrers

I use the following code to add PDF images to a PDF page:

import com.itextpdf.text.*;
import com.itextpdf.text.pdf.*;

                String file = ...
                    PdfReader reader = new PdfReader(file);
                PdfImportedPage page = writer.getImportedPage(reader, 1);
                Image img = Image.getInstance(page);
                        
When I use a particular multi-layer PDF file, the invisible layers become 
visible in the result image.  Is there any trick to keep the invisible layers 
invisible?

-------------------
Eli Segev

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