🚀 go-pugleaf

In article <18349@janus.trl.oz> lampard@janus.trl.oz (Greg Lampard) writes:
>Can someone please tell me what differences there are (if any) between 
>'normal' PostScript and 'Encapsulated' PostScript.  
>I ask merely for information.
>Thanks in advance,  Greg Lampard.

An Encapsulated PostScript file (EPSF) is a standard format for 
importing and exporting PostScript language files in all 
environments. It is usually a single page PostScript language 
program that describes an illustration. The purpose of the EPS 
file is to be included as an illustration in other PostScript 
language page descriptions. The EPS file can contain any 
combination of text, graphics, and images. An EPS file is the 
same as any other PostScript language page description, with 
some restrictions.

EPS files can optionally contain a bitmapped image preview, so 
that systems that can't render PostScript directly can at least 
display a crude representation of what the graphic will look 
like.  There are three preview formats: Mac (PICT), IBM (tiff), 
and a platform independent preview called EPSI.

An EPS file must be a conforming file, that is, it must conform to 
the document structuring conventions (DSC). At a minimum, it must 
include a header comment, %!PS-Adobe-3.0 EPSF-3.0, and a bounding 
box comment, %%BoundingBox: llx lly urx ury, that describes the 
bounds of the illustration.

Optional comments include font usage (%%DocumentFonts: or 
%%DocumentNeededResources: font), EPSI preview comments 
(%%Begin(End)Preview:), extensions (%%Extensions:) and language 
level (%%LanguageLevel:).

There are some operators that should not be used within an EPS file:
	banddevice	cleardictstack	copypage	erasepage
	exitserver	framedevice	grestoreall	initclip
	initgraphics	initmatrix	quit		renderbands
	setglobal	setpagedevice	setshared	startjob
These also include operators from statusdict and userdict operators like
legal, letter, a4, b5, etc.

There are some operators that should be carefully used:
	nulldevice	setgstate	sethalftone	setmatrix
	setscreen	settransfer	undefinefont
There will be a technical note available from Adobe called 'Guidelines for
Specific Operators' that will talk about why some operators are prohibited 
and how to use the others.

There is also a specification available on our server that talks about
EPSF in more detail.

Carl 8-)

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