From: gherman at my-dejanews.com (Dinu C. Gherman)
Date: Wed, 12 May 1999 12:41:06 GMT
Subject: reading PDF using Python [Q]
References: <000901be9661$02989220$6eba0ac8@kuarajy.infosys.com.ar> <FBGrt0.630@cix.compulink.co.uk> <3736A340.A056EA0C@ibm.net>
Message-ID: <7hbst2$ut1$1@nnrp1.deja.com>
Content-Length: 1507
X-UID: 1855                                                 

In article <3736A340.A056EA0C at ibm.net>,
  l.szyster at ibm.net wrote:
> This is a multi-part message in MIME format.
> --------------33948AEAB9B83FECD4C036D1
> Content-Type: text/plain; charset=us-ascii
> Content-Transfer-Encoding: 7bit
>
> Nick Moon wrote:
> >
> > If it weren't for the encryption and compression options you could
> > simply work on the files directly.
>
> Do you know more about PDF encryption and compression?

You may want to check the following paper below, also
discussing PDF, if only briefly and basically about
image compression. I'd assume, though, that algorithms
like LZW are also used for textual compression.

Regards,

Dinu



Information Architecture White Paper
IA-6801: Electronic Image Formats and
Compression Algorithms

http://www.lanl.gov/projects/ia/stds/ia680120.html

Abstract

This white paper discusses relative strengths and weaknesses
of image formats and corresponding compression algorithms
well suited to the sharing of simple graphical images across
multiple platforms. It does not address formats for specialized
applications such as GIS, CAD, three-dimensional modeling,
scientific visualization, atmospheric/environmental modeling,
or tools used to create/process graphics primarily intended
for printing.

The specific formats discussed are TIFF, JPEG/JFIF, GIF, PNG,
and PDF; the compression algorithms are CCITT 3 and 4, JPEG,
LZW, and PNG 0.



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