[NTG-pdftex] Possible Bug: Ligatures and special Character in included pdf disappear in typetted document

Jan Michael jan.michael at gmail.com
Thu Sep 18 12:51:18 CEST 2008

Dear Readers,

as the subject already states, my documents created with pdflatex are  
loosing their ligatures and other special characters from included pdf  
documents which were typesetted by other applications (Word, Excel,  
Omnigraffle ...).

(a) Situation

This is how the behaviour can be reproduced and how it happens in my  

(1) Import Latin Modern fonts as otf into system wide font location
(2) Create a document with Latin Modern Roman font and use ff, fi, fl  
(3) Save Document as PDF (in OS X it's just "Save as PDF ...") - the  
pdf still shows the ligatures
(4) Include the created pdf into a *.tex document with \includegraphics
(5) Typeset the document with pdflatex
(6) Ligatures from included pdf document disappear while inline  
ligature are typeset as usual.

(b) Minimal Example

ligaturen.pdf can be downloaded from <https://dl.getdropbox.com/u/73200/ligaturen.pdf 

(c) Problem Analysis
This is what the the German tex usenet group de.comp.text.tex has  
already figured out:

- problem can be reproduced with MiKTeX 2.6 and TexLive 2008 (Windows)
- names of ligature glyphs in included pdf (f_i, f_l, f_f) differ from  
names used by pdftex (fi, fl, ff)
- font from included pdf is replaced by pdftex -> glyphs f_i, ...  
won't be found anymore
- behaviour can be suppressed by using \pdfmapfile{}
- behaviour can be suppressed by removing or renaming related fonts in  
- behaviour can be suppressed by typesetting the pdf with xe(la)tex  
before including it in pdf(la)tex document. XeTeX redeclares the font  
in ligaturen.pdf from JTSEMF+LMRoman10-Regular to ASKXQL+LMRoman10- 

The related thread, in German language, can be found here:

Right now I use the workaround with XeTeX to get my documents right.  
What do you think?




p.s. Please see pdf(la)tex version information below:
(from TexLive 2007 shipped with MacTeX 2007 package on MacBook
C2D running OS X 10.5.5)

$ pdflatex -v
pdfTeX 3.141592-1.40.3-2.2 (Web2C 7.5.6)
kpathsea version 3.5.6
Copyright 2007 Peter Breitenlohner (eTeX)/Han The Thanh (pdfTeX).
Kpathsea is copyright 2007 Karl Berry and Olaf Weber.
There is NO warranty.  Redistribution of this software is
covered by the terms of both the pdfTeX copyright and
the Lesser GNU General Public License.
For more information about these matters, see the file
named COPYING and the pdfTeX source.
Primary author of pdfTeX: Peter Breitenlohner (eTeX)/Han The Thanh  
Kpathsea written by Karl Berry, Olaf Weber, and others.

Compiled with libpng 1.2.15; using libpng 1.2.15
Compiled with zlib 1.2.3; using zlib 1.2.3
Compiled with xpdf version 3.01

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