[XeTeX] Kerning support
list.adam at twardoch.com
Mon Apr 21 16:45:49 CEST 2008
The easiest is to just look up the current kerning value and change it.
For example, in Myriad Pro the kerning value between the class that
consists of quoteright and quotedblright and the class that consists of
comma, period and ellipsis is -154.
The safest way to deal with TTX is to dump and later merge only the
relevant table, not the whole font. In case of OpenType kerning, the
relevant table is GPOS. So:
ttx -tGPOS MyriadPro-Regular.otf
After converting the GPOS table of the .otf OpenType file to a .ttx XML
file, I look for the string "-154" (including the quotation marks). I
get only one occurance of that:
I simply change the value -154 to whatever I want and merge the modified
GPOS table back into the .otf font. (If the value occurs several times,
you may want to do several attempts or try to understand the internal
structure of the GPOS table, but it's a bit more complex than I could
ttx -m MyriadPro-Regular.otf MyriadPro-Regular.ttx
We will get a file MyriadPro-Regular#1.otf which will have the modified
Charles de Miramon wrote:
> Adam Twardoch wrote:
>> Changing one or two kerning pair values in your own local copies of a
>> font is trivial using
>> (just convert the font to XML, change the values using a text editor and
>> convert the font back to OTF). The license agreement for Adobe fonts
>> allows that.
> Could you explain for fonts newbies, where and what do you modify in the XML
> file to add some space between a quote and a final punctuations.
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