Hello,
Thank you all very much. I'm pleased with number and quality of solutions to my
problem.
The winner solution is provided by Wolfgang Schuster. Simple \centeredbox{}
makes all the magic I need.
I was also amazed with quick porting of my Lua code for batch image processing
to native TeX script. I'm an imperative programmer to the marrow and never will
be able to do such things. Luckily, now we have embedded Lua!
Best regards,
Vyatcheslav Yatskovsky
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