Path: utzoo!attcan!uunet!mcvax!ukc!acorn!john
From: john@acorn.co.uk (John Bowler)
Newsgroups: comp.lang.postscript
Subject: Re: Encoding Symbol glyphs into Latin 1 set
Summary: What is the Adobe ISO-Latin1 encoding vector?
Message-ID: <725@acorn.co.uk>
Date: 27 Feb 89 17:39:00 GMT
References: <8902231344.AA05555@decwrl.dec.com> <419c6984.1830f@apollo.COM>
Organization: Acorn Computers Limited, Cambridge, UK
Lines: 28

In article <8902231344.AA05555@decwrl.dec.com>, batcheldern@hannah.dec.com (Ned Batchelder, PostScript Eng.) writes:
> 
> >>   .. the Adobe latin 1 character set does not conform to the
> >>   ISO standard.
> 
> In what way does Adobe's ISOLatin1Encoding encoding vector not conform to
> the ISO standard?

Is this a different encoding to that on page 252 of the Red book?  If so -
where is it defined?  If not the answer to the question is that it lacks all
of the `composite' characters from the ISO-Latin1 (ie all the alphabetics with
accents) and has the ANSI currency symbol in a different place (the same place
as in the DEC multinational character set, which is only slightly different
from ISO-Latin1...)  There are also several additions (eg perthousand) and
ommissions (eg the fractions and plusminus - which is in the Symbol encoding).

I believe that the answer to the original question is that the the character
from a suitable symbol font must be extracted and placed in the new font
along with the encoding which references it - all that the encoding says is
how to map byte values in strings into the name of a character definition
in the font dictionary.  Therefore if the encoding:-

	177 --> plusminus

is added to the encoding vector a character (plusminus) must also be added
to the font dictionary (in the CharStrings dictionary).

John Bowler (jbowler@acorn.co.uk)