[softwarelist] Re: PostScript and PDF

In message <nrQDjaFMLaOJFwoE@xxxxxxxxxxxxxxxxxxx> you wrote:

> It gets more complicated. Tonnie Demarteau has just reminded me that OPW 
> uses a custom encoding - this is to handle the legacy character set from 
> RISC OS. When I was developing the direct PS code, one episode involved 
> not being able to save text from a PDF using Adobe reader, again due to 
> the encoding, to resolve this fonts are declared as symbol fonts.
> 
> All this stuff is not optional, PostScript is based on bytes, i.e. 256 
> characters, in general a Unicode document will use more than 256 
> characters, the way around this is to generate multiple versions of 
> fonts.

You could have used CID font technology which does not have a 256 character
limitation. Together with a ToUnicode mapping
(<URL:http://www.adobe.com/devnet/acrobat/pdfs/5411.ToUnicode.pdf>)
it makes text in a PDF file (after distilling your PS file) searchable and
extractable again.

John.
-- 
John Tytgat, in his comfy chair at home                                 BASS
John.Tytgat@xxxxxxxx                             ARM powered, RISC OS driven
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