rcj2@cbnewsd.ATT.COM (ray.c.jender) (01/17/90)
I think I know how postscript works. But exactly what is Encapsulated PS, how does it work and can I convert one to the other? I have 2 programs. One creates Postscript the other reads Encapsulated Postscript. Needless to say, I can't use one with the other. Am I on another planet or what????? Ray Jender att!cbnewsd!rcj2
rick@hanauma.stanford.edu (Richard Ottolini) (01/17/90)
In article <12702@cbnewsd.ATT.COM> rcj2@cbnewsd.ATT.COM (ray.c.jender) writes: > > I think I know how postscript works. But exactly what > is Encapsulated PS, how does it work and can I convert > one to the other? I have 2 programs. One creates Postscript > the other reads Encapsulated Postscript. Needless to say, > I can't use one with the other. Encapsulated Postscript contains the bitmap of the rendered image before the drawing commands. Some versions contain only the bitmap. The bitmap is not as good as the drawing commands because it implements a device resolution.
woody@rpp386.cactus.org (Woodrow Baker) (01/17/90)
In article <12702@cbnewsd.ATT.COM>, rcj2@cbnewsd.ATT.COM (ray.c.jender) writes: > > I think I know how postscript works. But exactly what > is Encapsulated PS, how does it work and can I convert > one to the other? I have 2 programs. One creates Postscript > the other reads Encapsulated Postscript. Needless to say, > I can't use one with the other. > > Am I on another planet or what????? > > > Ray Jender > att!cbnewsd!rcj2 perhaps. This topic has been dealt with over and over on comp.lang.postscript but to summarize, EPS is simply a semi-standard formatting specification. It uses comments to separate sections of the postscript file. Certain comments convey information about the image, such as BoundingBox info and the like. A EPS aware program can parse these comments, and know how to transform, place and size the documents. You can get a copy of the documents from the ps-fileserver@adobe.com mail a message: send help for help in useing the server. mail a message send index for an index send index Documents will get you a list of documents send Document xxxx will get you document xxxx. One note, these things are in the form of postscript files and need a printer to print them. Cheers Woody
pdsmith@bbn.com (Peter D. Smith) (01/17/90)
Well, not exactly. EPS does not have to include a bitmap. Basically,
an EPS file is a DEAD NORMAL PS file except that
-1- There are some extra double-% comments; the most important of
which is '%%BoundingBox: llx lly urx ury
-2- There are a series of forbidden PS commands, among them
erasepage, grestoreall, initclip, inigraphics, initmatrix.
showpage IS allowed (the other program must neutralize it).
-3- Since the point of an EPS file is that it is swallowed up,
lock, stock, and barrel by another program which will surround
(encapsulate!) it, it is CRITICAL that the stack be left just
the way it started.
The book 'Understanding Postscript programming (second edition)' by
David A. Holzgang is a lousy reference, but has a very clear EPSF
section.
Note on competance: I am in the finishing stages of converting my
companies product from producing Postscript to producing EPS.
Peter D. Smithkeithm@ashtate (Keith Mund) (02/09/90)
Encapsulated PostScript can be described as most any PostScript file that includes special instructions, disquised as comments, to describe the item. A minimum for the header is: %!PS-Adobe-2.0 EPSF-1.2 %%BoundingBox: llx lly urx ury The two corners are represented as numeric values in a real file. There are certain restrictions on which commands may be used, but they are sensible, like don't use "grestorall" etc. Adobe has a ducument entitled "Encapsulated PostScript File Format" EPSF Version 1.2, March, 1987 (newer revision too?) that describes this and the rest of the story. They are in Sunnyvale, CA. The company has been happy to offer information, so I think they will help you. There are files like this, often in PostScript language format for great printing, available from them. They are also on Compuserve, and hopefully somewhere relating to this net. Hope this has helped. Keith Mund