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After recent update of Asana-Math (packaged for MiKTeX on 2011-10-11) I noted that Greek letters and various arrows disappear from PDF file after it was saved from within Adobe Acrobat 10 (via the menu File | Save As | PDF...). I use such method of saving file to reduce its size. Asana-math font is loaded as follows:

\usepackage[math-style=ISO,bold-style=ISO]{unicode-math}
\setmathfont{Asana Math}

Note that the problem appears only if (1) my document is compiled with LuaLaTeX and only if (2) Asana-math font is loaded. XeLaTeX or STIX fonts work fine. I am sure that this problem did not exist before I updated Asana-Math a week ago (on 2011-10-28) since every week I compile new lecture for students and all previous lectures are OK.

Having opened PDF file in ordinary text editor, I see that the word asana disappears after saving PDF file from Acrobat. It means that Acrobat removes Asana-math font from the file.

But why?

Update: I located a table in my book that caused the trouble. Here is minimal example extracted from that table:

\documentclass{article}
\usepackage{fontspec}
    \defaultfontfeatures{Renderer=Basic,Ligatures={TeX}}
    \setmainfont[Numbers={OldStyle}]{Minion Pro}
\usepackage[math-style=ISO,bold-style=ISO]{unicode-math}
    \setmathfont{Asana Math}    % damaged
    %\setmathfont{STIXGeneral}  % OK
    %\setmathfont{Cambria Math} % OK

\begin{document}%
    Fuel $T_{Br}$ $T_{\min}$ $\min(P_{Br}/P_{fus})$ \\
    ${D}{T}$ 2.7  39.4 $5{,}3\times 10^{-3}$ \\
    ${D}{D}$ 57.7 553 $4{,}1\times 10^{-1}$   \\
    ${D}[3]{He}$ 29.0 152 $1{,}4\times10^{-1}$ \\
    ${p}[11]{B}$ 295 2{,}6 
\end{document}

Originally, compiled PDF file looks fine:

test-asanamath-compiled-by-lualatex

However some latin and greek letters, math symbols disapper after it was saved from within Adobe Acrobat:

test-asanamath-compiled-by-lualatex-and-saved-from-adobe

This damage does not occur if source file was compiled with the aid of xelatex or if other math fonts is loaded. Here is how saved PDF looks when Cambria Math was used:

enter image description here

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3  
please give a complete minimal example. –  Herbert Nov 1 '11 at 17:03
    
@Herbert: I added minimal example as you requested. –  Igor Kotelnikov Nov 4 '11 at 4:35

2 Answers 2

up vote 2 down vote accepted
+100

Looks like if you ran into a bug in Adobe Reader. The MacOS version is known for bugs when using OpenType fonts (e.g. 10.6.7 causes OpenType issues).

As a solution when you want to compress the PDF file, you can use the program ps2pdfwr, which is a wrapper for ghostscript.

ps2pdfwr <inputfile> <outputfile>

This is a short-hand for the following:

gs -sOutputFile=<outputfile>
   -dNOPAUSE
   -dSAFER
   -sBATCH
   -sDEVICE=pdfwrite
   <inputfile>

Beware: This also recompresses included JPEG images, which may result in quality loss.

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If so, why then there is no evidence of such problem if xetex is used to compile my file? –  Igor Kotelnikov Nov 7 '11 at 4:15
    
XeTeX and LuaTeX employ a different approach when it comes to font handling. XeTeX uses FreeType and Fontconfig, however LuaTeX uses fontforge internally. The final result in the PDF reader should be the same, though the PDF files differ. Apparently the output file of LuaTeX triggers the bug. –  Marco Nov 7 '11 at 7:56
    
@Macro, how fonts are loaded shouldn't affect the final PDF, but rather how they are embedded in the font; XeTeX uses a separate driver (xdvipdfmx or xdv2pdf) to generate the PDF while LuaTeX has its own "built-in" PDF backend. But you are right, since both are totally different code bases the resulting PDF can be quite different internally. –  Khaled Hosny Nov 9 '11 at 4:20

I found a method how to keep fonts embedded. From Adobe Acrobat 10 menu select: File | Save As | Optimized PDF... and in the field Make compartible with select Acrobat 9.0 and later or Acrobat 10.0 and later (I did not try other versions).

Unfortunately, this method removes poster images for embedded swf movies (whereas poster images for embedded avi movies are OK). So, this indeed looks as if the problem is caused by inteference of some Asana-Math "features" and Acrobat bugs.

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