[poppler] LZW compression with Poppler

Thomas Freitag thomas.freitag.bbr at gmail.com
Sat Sep 14 03:28:46 PDT 2013

Hi Aldo!

(Please use my private E-Mail for any further communication).

First of all, PDFs itself are NEVER LZW compressed, they only CONTAIN 
streams that can be LZW compressed (streams can be compressed with 
several compressions, one of it can be LZW).
Therefore the LZW decompressor is part of a stream object and can be 
find in Stream.cc.
Poppler is designed for reading PDF, not for creating PDF (with a few 
exceptions), therefore You'll find only the LZW decompressor, not a 
compressor. In cases where poppler writes a PDF file, it doesn't 
compress streams i.e. with a LZW compressor, it just writes the streams 
as they are in the source PDF.

I would prefer, that You ask questions like this over the official 
poppler account, poppler at lists.freedesktop.org.


Am 14.09.2013 03:24, schrieb Aldo Camargo:
> Dear Thomas:
> Do you know if there is a function within Poppler to do LZW compresion 
> of PDF files?
> Thanks a lot in advance,
> Aldo
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