Path: utzoo!attcan!uunet!samsung!uakari.primate.wisc.edu!sdd.hp.com!andrea
From: andrea@sdd.hp.com (Andrea K. Frankel)
Newsgroups: comp.graphics
Subject: Re: Anybody heard of CCITT graphics standard?
Keywords: fax CCITT TIFF
Message-ID: <1990Sep28.193554.26047@sdd.hp.com>
Date: 28 Sep 90 19:35:54 GMT
References: <4368@trantor.harris-atd.com> <2157@van-bc.wimsey.bc.ca>
Distribution: na
Organization: Hewlett-Packard, San Diego Technical Graphics Division
Lines: 30

In article <2157@van-bc.wimsey.bc.ca> jtc@van-bc.wimsey.bc.ca (J.T. Conklin) writes:
>In article <4368@trantor.harris-atd.com> rbarr@su19o.UUCP (Rick Barr) writes:
>>A customer has requested that we deliver data in CCITT group 4 graphics
>>format.  Anybody know what this is?
>
>They are probably requesting raw CCITT T.6 encoded data, as is
>transmitted between two Group 4 facsimile machines.  The T.6
>specification only specifies transmitted data; it doesn't dictate how
>this should be represented in a file, as image storage is outside its
>domain.
>
>When dealing with images of this nature, I prefer to encapsulate them
>in TIFF files, which have the necessary tags to specify image size,
>image resolution, bit order, photometric interpretation, etc...

Another possibility is that the customer is a DOD contractor or
subcontractor who is required to have CALS conformant files.  The CALS
program selected CCITT group 4 for interchange of raster information,
and they defined their own file header for size, resolution, etc.  See
MIL-R-28002 for details.  Unfortunately, though, it's only bilevel at
this time.

Andrea Frankel, Hewlett Packard, San Diego Technical Graphics Div., R&D Lab
	"wake now!  Discover that you are the song that the morning brings..."
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