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Topic: Re: 4-BIT, 8-BIT ZIP compression issue (Via Email)
Conf: (P-PDF) Acrobat 6.0, Msg: 125513
From: LeonardR
Date: 1/14/2005 06:35 PM

At 03:11 AM 1/14/2005, p-pdf-acrobat6 Listmanager wrote:
>Can anybody give me an explanation as to why Acrobat 6 (MAC) does not make
>4-bit or 8-bit ZIP compressions as effectively as Acrobat 4 on MAC?

Acrobat 6 actually does MORE efficient ZIP/Flate compression than
Acrobat 4 does (uses a higher level default value).

(FYI: ZIP/Flate compression isn't measured by "bits"...)

>When I distill under Acrobat 4
>using 4-bit ZIP compression, my PDF file size is nearly half the size of
>doing a comparable ZIP compression under Acrobat 6.

That's correct - but has NOTHING to do with the Flate compression.

It has to do with the fact that Acxrobat 6 includes additional
things in the PDF by default that Acrobat 4 did not (for example, embedding
the Base 14 fonts).


Leonard Rosenthol
Chief Technical Officer
PDF Sages, Inc. 215-938-7080 (voice)
215-938-0880 (fax)

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