Planet PDF Forum Archive

Planet PDF ForumWowsers! This is page is old, head to the LIVE Planet PDF Forum. It features more than 10 conferences, covering everything from beginner to in-depth developer and pre-press discussions. If you wish to continue... one & two archive covers 1999-2011 (160,000 pages).

New Forum | Previous | Next | (P-PDF) Developers

Topic: Re: Image Extraction and Replacement in PDF File
Conf: (P-PDF) Developers, Msg: 57472
From: LeonardR
Date: 5/29/2002 05:26 PM

At 04:15 AM 11/21/2001 +1100, p-pdf-developer Listmanager wrote:
>Ok, now i like to make sure something before i start to do (am i too rude ?
>sorry for this, I am good in programming language not English !!) .

And he continues to make progress...

>Extract Image from a PDF which is using FLATE Filter ( what i plan to do is
>a) Extract Image data between stream and endstream.
>b) Decompress the data using zlib (we are getting binary data)
>c) compress the data using libjpeg and save it as .jpg. (what function i
>have to call)

That will certainly work.

HOWEVER, consider that by using JPEG (which is a LOSSY
algorithm/format) you may/will end up damaging your data. I would
recommend saving the images as PNG, since it's lossless.

>Insert Image into PDF
>a) uncompress the original image data using libjpeg. (what function i have
>to call)

If the original image is already JPEG, then you don't have to
decompress at all! Just copy the image data from the file between
stream/endstream and mark the image as using DCTFilter.


PDF In-Depth Free Product Trials Ubiquitous PDF

Debenu Aerialist

The ultimate plug-in for Adobe Acrobat. Advanced splitting, merging, stamping, bookmarking, and link...

Download free demo

Debenu PDF Tools Pro

It's simple to use and will let you preview and edit PDF files, it's a Windows application that makes...

Download free demo

Five visions of a PDF Day

In the world of PDFs or as we like to say Planet (of) PDF, a year isn't a real PDF year without an intense few days of industry knowledge sharing.

May 15, 2018
Platinum Sponsor

Search Planet PDF
more searching options...
Planet PDF Newsletter
Most Popular Articles
Featured Product

Debenu PDF Aerialist

The ultimate plug-in for Adobe Acrobat. Advanced splitting, merging, stamping, bookmarking, and link control. Take Acrobat to the next level.


Adding a PDF Stamp Comment

OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.