[XeTeX] wrong kerning and slow processing with xelatex intexlive 2010

John Was john.was at ntlworld.com
Wed Oct 13 15:23:47 CEST 2010

Just as a postscript to this thread, I've several times asked for (and still 
hope to see)  a custom kerning facility in XeTeX (this is already available 
in LuaTeX).  The idea would be that when you call up a font you can say 
':kerning=mykern.krn' just as you can say ':mapping=tex-text'.  The file 
'mykern.krn' would be something that the user writes to a specified syntax, 
and it would supplement (including overriding) the kerning information 
supplied by the font itself.  Any unsatisfactory pairings could then be 
sorted out by the user without the need to edit the font (which might be 

Whenever I do mention this, a few people usually react to say that it would 
be a good idea - but perhaps too few to bring the task to the front of the 
hard-pressed programmers' queue.


----- Original Message ----- 
From: "Vadim Radionov" <vadim.radionov at gmail.com>
To: "Unicode-based TeX for Mac OS X and other platforms" <xetex at tug.org>; 
<lomov.vl at gmail.com>; "Peter Dyballa" <peter_dyballa at web.de>
Sent: 13 October 2010 14:10
Subject: Re: [XeTeX] wrong kerning and slow processing with xelatex 
intexlive 2010

>I finally found the explanation. Mea culpa, it was in the kerning in
> the font. All 3 lookup tables contained kerning -50 for small caps
> Cyrillic `t' and `a', and the was another one of -60 in kerning
> classes, which gave the total of -210.
> I'm not sure if it is allowed and what should be the default behavior
> of typesetting program -- to add them of to use the last. If it is
> stated somewhere and you can point me to it, i will complain to my
> font vendor. And of course I will check for such cases myself and wipe
> out extra kerning.
> Peter and Vladimir, thank you for your help and patience.
> Vadim
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