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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.


Leonard


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