RE: [cgmo-webcgm] draft text- CGM gzip compression

[Robert Orosz <roboro@auto-trol.com>]

Don,

Just to be clear, it is only the binary encoded form of CGM that can be
compressed to CGZ format, right?

I am curious as to how much compression can be achieved with different types
of CGMs; i.e. vector elements only, raster elements only, mixed, etc.  Have
you (or anyone else in the group) done any investigations on this?

Rob

-----Original Message-----
From: Don Larson [mailto:dlarson@cgmlarson.com]
Sent: Wednesday, March 05, 2008 1:24 PM
To: CGM Open WebCGM TC
Subject: [cgmo-webcgm] draft text- CGM gzip compression


All

Insert under 1.2 Normative references:

   RFC 1952
     GZIP file format specification

Insert new section under 2.4 Encoding:

2.4.1 Compression

HTTP/1.1 allows for compressed data to be passed from server 
to client,
which can result in significant file size reduction.  CGM 
data maybe 
compressed for transmission using gzip compression. It is 
recommended 
that gzip-compressed CGM files have the extension ".cgz" (all 
lowercase)
on all platforms.

(gzip should be linked to)  
http://www.ietf.org/rfc/rfc1952.txt

Questions- 

Do we need to add CGZ under MIME type section of W3C Overview 
of WebCGM Profile?
http://www.w3.org/Graphics/WebCGM/

Normative reference to? http://www.iana.org/assignments/media-
types/image/cgm

Regards,
Don

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