Re: PostScript 3 & PDF
Re: PostScript 3 & PDF
- Subject: Re: PostScript 3 & PDF
- From: Stéphane Beaudry <email@hidden>
- Date: Tue, 04 May 2004 11:41:47 -0400
When a RIP converts PDF to PostScript, it does tend to create better
structured PostScript code than most applications generate directly,
since it mostly converts the file on a "PDF keyword to PS keyword"
basis. PostScript offers so many variations that may overwhelm some
RIPs, for instance the infamous "Optimize for speed" option that Windows
98 offered and which could have easily been renamed "make sure the file
won't work with anything else".
Still, Acrobat is sometimes misleading since it sometimes tolerates bad
PDF code that the RIP won't be able to convert. I had an issue where a
couple of keywords in the file had letters missing for some reasons and
Acrobat displayed the file without any problem. Of course, when the RIP
got it, it didn't work.
Stephane Beaudry
R&D
TGLC Color Management Inc.
----- Original Message -----
From: "Chris Murphy" <email@hidden>
To: "coloru" <email@hidden>
Cc: "Mark Rice" <email@hidden>
Sent: Tuesday, May 04, 2004 11:03 AM
Subject: re: PostScript 3 & PDF
>
On May 4, 2004, at 5:08 AM, Mark Rice wrote:
>
>
> I believe PDF is Postscript Level 3. When .ps files are sent to a
>
> Postscript Level 3 RIP, the ps is converted to PDF in the
>
> "normalizer". So
>
> you can save some conversions by dropping a PDF directly into the
hot
>
> folder
>
> on a PS3 RIP.
>
>
PDF is a superset to PostScript. There are things that PDF can do that
>
PostScript cannot. PDF is declarative whereas PostScript is
>
interpretive, and is also a programming language. They're really not
>
the same thing, by design. Adobe PostScript 3 RIPs that accept PDF
>
convert to PostScript then interpret but they have some special
>
handling both on the application side and the RIP side to deal with
>
unique PDF features like transparency. There are a couple of RIPs on
>
the market that rasterize PDF directly, Harlequin being one of them.
>
>
Chris Murphy
>
Color Remedies (TM)
>
www.colorremedies.com/realworldcolor
>
---------------------------------------------------------
>
Co-author "Real World Color Management"
>
Published by PeachPit Press (ISBN 0-201-77340-6)
>
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