Re: PS vs. EPSF?

Subject: Re: PS vs. EPSF?
From: David Venzke <dven -at- COBRA -dot- CLEO -dot- COM>
Date: Mon, 10 Oct 1994 14:12:05 EDT

greta ward asked:

>We are in the process of (preparing to) convert a large LaTeX document
>replete with equation and figures to HTML for ultimate dissemination on
>WWW. The LaTeX code is no problem. We have a translator which seems to
>work pretty well. However, the figures were all created on a Mac using
>Illustrator 5.0 which saves the files as EPSF. Apparently, we need plain
>vanilla postscript files for the translation to work properly ... so my
>question is two-fold:

> 1. What is the difference between ESP/EPSF and PS? I seem to
> vaguely remember something about the bounding box ...

"An encapsulated PostScript file," according to my copy of _Encapsulated
PostScript File Format Specification_ (Copyright 1992 Adobe Systems Inc.),
"is a PostScript language program describing the appearance of a single page.
Typically, the purpose of the EPS file is to be included, or 'encapsulated,'
in another PostScript language page description. The EPS file can contain any
combination of text, graphics, and images, and it is the same as any other
PostScript language page description with only a few restrictions."

In essence, an EPS file is a relatively plain PostScript file which has
several comments added to it. While there are a lot of recommended comments,
two are essential:

%!PS-Adobe-3.0 EPSF3.0
%%BoundingBox: ...coordinates...

EPS files may also contain an optional screen preview image (bitmap) at the
end of the file, as well as a 30-byte binary header.

> 2. Is it possible to turn these existing EPSF files into PS
> files - and if so, any suggestion how (again, consider the
> macinstosh platform).

The sort answer is yes. The more complicated part is how to...

1. You could open each file in Illustrator and print to a PostScript file,
instead of a printer. This should give you PostScript output.

2. TechPool Software has a PostScript Tool called Transverter Pro that
converts PS files to EPS ... but I don't know if their software will do
the reverse. (800) 925-6998 .or. (216) 291-1922. I don't use this but
have read good things about it.

3. You can manually edit the files, removing EPS specific stuff (this option
is fraught with possible problems, though).

Hope some of these comments are of use.

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