[OS X TeX] generating eps files

Maarten Sneep maarten.sneep at xs4all.nl
Wed Jun 9 13:48:14 CEST 2004

On 9 jun 2004, at 13:41, Nigel King wrote:

> Sometimes guys take drawings that I have done in MetaPost and import 
> them into other applications such as Illustrator which only seem to 
> import eps files.
> I obviously generate MetaPost output and pdf output for each diagram. 
> What is the best way to produce from one of these eps? I have tried 
> pdf2ps but that doesn't 'appear' to encapsulate the font.

A while ago I had a discussion with someone from Elsevier, and together 
we came
up with the following solution. Have they tried to import the pdf? 
AFAIK Illustrator
uses pdf as its native file format these days. Anyway: the following 
(long) explanation
will work (for eps).



Submitting figures for publication.

One of the areas where things may go wrong when submitting an article
for publication can be the figures. This has (mainly) to do with the
fonts. There are two solutions to this problem. One solution (if the
journal supports it) is to use pdf-files, as all fonts -- or rather the
glyphs actually used in the figure -- are included in the file. This
leads to very predictable results. the other solution requires removal
of the use of all fonts from a file. This leaves no lettering that can
go wrong. I'll explain both methods -- and especially the last one -- in
more detail below, including some useful commands to get the files.

Option 1: use pdf.

There are several options to obtain pdf-files. xmgrace (shudder) has an
option to export to pdf directly, Illustrator can export to pdf (in fact
its native format is an elaborate form of pdf). I have created all my
figures in MetaPost, and for that format the programs mpost and mptopdf
take care of the conversion to pdf.

You can verify that your pdf is functioning correctly, by opening it in
Acrobat Reader, and select the font information in the document info
window (in acrobat 5 under linux: the small triangle in the top-right
corner of the window). If all fonts are listed as "Type 1, embedded
sub-set", you're golden.

For personal use, I advice you to translate all your figures into pdf,
if needed with the epstopdf tool on the command-line. The pdf-format
allows for much easier and consistent verification of the final output.

Option 2: use eps, without the use of fonts for the glyphs.

This may sound nuts: how can you label anything, without using any
fonts? Letters are just small but complicated drawings, and instead of
instructing the printer to use the letter "a" from font "Times", you put
the curves and lines for that letter in your file. This is called
replacing text by its outlines, and can be done by using ghostscript.
Note that there is one drawback: the text disappears from the file, and
can no longer be easily editted (say with Illustrator). Also the
instructions in a font are compressed, so the final file will be
somewhat bigger. If you need to put equations into an Illustrator file,
or in any drawing application that supports eps files, this trick may be
applied to snippets for LaTeX code, an example follows below.

For submitting metapost based figures as eps, it is imperative to
replace all fonts by their outlines, as the raw eps code produced by
metapost is fundamentally unusable by most applications (notably
Illustrator, which is used by Elsevier to touch up and check incoming
files). The method discussed below generates the eps files that Elsevier
(and possibly others) can use without trouble. Elsevier accepts
pdf-files for most journals, but likes eps files better.

Whether you have a figure in eps or in pdf format, if the journal
requires you to deliver an eps file, you can use ghostscript to create
this file, and remove font-dependencies at the same time:

	gs -dNOPAUSE -dNOCACHE -dBATCH -sDEVICE=epswrite \
		-sOutputFile=your-output-file.eps \

A few notes:
- Do not give the input- and output files the same name.
- you can translate the result into pdf (with epstopdf) to verify that
   there are indeed no fonts used in the result.
- replace the file-names with actual names.
- When something is involved that uses LaTeX in any way, start from a
   known good pdf.
- Ghostscript can read pdf-files, so your-source-file.eps may be 
   by your-source-file.pdf

Now the bonus subject: getting LaTeX formatted equations into another
drawing application. I'll just give an example, you figure it out.

%%% sample file: rayleigh-dist.tex
\usepackage{amsmath} % slightly more advanced mathematical typesetting.
\usepackage{txfonts} % most journals require times or similar.
\pagestyle{empty}    % you do not want to include a pagenumber...
\begin{equation*} % no equation number
	I_{\text{\scriptsize n}}\left(\vartheta\right) =
	\left( {\frac{9 \pi^2 \bar\nu^4}{2 N^2}} \right)
	\left( {\frac{n_{\bar\nu}^2-1}{n_{\bar\nu}^2+2}} \right)^{\!2}
	\left( 1 + \cos^2 \vartheta \right)
\end{equation*} % the Rayleigh intensity distribution.
%%% end of sample file

- run the above file through latex and dvips:

	elatex rayleigh-dist
	dvips -o rayleigh-dist.tmp.eps -E rayleigh-dist.dvi

- run the eps through ghostscript, translating all letters into

	gs -dNOPAUSE -dNOCACHE -dBATCH -sDEVICE=epswrite \
		-sOutputFile=rayleigh-dist.eps \

Full steps for producing metapost based eps for submitting to a journal.

- make your metapost source file.
- turn your description into metapost output:
	mpost -tex=latex source.mp
- turn the metapost-output into pdf (repeat for all figures in this
   input file):
	mptopdf source.0
- turn the pdf into eps with font-outlines:
	gs -dNOPAUSE -dNOCACHE -dBATCH -sDEVICE=epswrite \
		-sOutputFile=source.eps \

%%% Begin of sample metapost file
%%% In case you're wondering: this is the angular distribution of 
scattered radiation
%%% from a molecule (Rayleigh scattering).

prologues := 2 ; % create structures PS.

beginfig(0) ;
	picture myDash;
	myDash := dashpattern( on 4pt off 2pt );
	%% a graph of the intensity distribution of the scattered light 
(natural light version)
	draw (0,0) -- (3.2cm,0) withpen pencircle scaled 0.5pt withcolor black;
	draw (0,-1.676cm) -- (0,1.676cm) withpen pencircle scaled 0.5pt 
withcolor black;
	drawarrow (-3.2cm,0) -- (-4pt,0) withpen pencircle scaled 1pt 
withcolor black;
	draw (-4pt,0) -- (0,0)  withpen pencircle scaled 0.5pt withcolor black 
	draw btex light etex shifted (-2.5cm,2mm);
	draw for i=0 step 5 until 360:
		1.524cm * ((sind(i))**2) * (sind(i), cosd(i)) ..
	endfor cycle dashed myDash withpen pencircle scaled 0.5pt ; % 
withcolor 0.5*white;
	draw for i=0 step 5 until 360:
		1.524cm * (sind(i), cosd(i)) ..
	endfor cycle dashed myDash withpen pencircle scaled 0.5pt ; % 
withcolor 0.5*white;
	draw for i=0 step 5 until 360:
		1.524cm * (1 + ((sind(i))**2)) * (sind(i), cosd(i)) ..
	endfor cycle withpen pencircle scaled 0.5pt withcolor black;
	draw origin -- (3.2cm,0) rotated 20 withpen pencircle scaled 0.5pt 
withcolor black;
	drawarrow for i=0 step 4 until 16:
		((2.2857cm,0) rotated i) ..
	endfor ((2.2857cm,0) rotated 20) withpen pencircle scaled 0.5pt 
withcolor black;
	draw btex $\vartheta$ etex rotated -10 shifted (2.438cm,-3pt) rotated 
	fill fullcircle scaled 3pt withcolor black;
endfig ;


%%% end of sample metapost file

Note that pdflatex can include metapost output directly, although it 
be a good idea to replace the extension (.0, .1, ...) by .mps, otherwise
latex may not recognize the format. This has the advantage that any 
that are used in the figures will not be included multiple times. Pdftex
inserts the figure files without alterations, and fonts can thus be 
multiple times. Having pdftex do the translation merges the characters 
in the whole file, and thus prevents this double inclusion. The 
is that the translation is relatively slow, and you may run out of some 
of memory in latex (and you cannot enlarge those sizes any further) -- 
need to be pretty extreme here though. For draft usage, I'd advice to
pre-translate the metapost output into pdf, as it dramatically reduces 
latex run-time.

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