[softwarelist] Re: PostScript and PDF


I looked up the problem about not being to edit the PDFs on Google:

http://software-robotics.com/adobe_acrobat_pdf_embed_font.php
http://forums.macosxhints.com/archive/index.php/t-66909.html

There are a lot more. One quote I found is:
"Be warned also that you cannot edit text if the font is not installed on your system, even if the font is embedded in the PDF file. (This nasty restriction is a new "feature" in Acrobat 6...) ". I have also read there's a way of linking names of fonts in the PDF to fonts on your system.
By now, you've covered the same ground. Subsetting looms large, and they say there is a font menu that shows you what fonts are available.
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.
I've still to sort out what OPW is doing with the font substitution table - more about that later. 


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David Pilling
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