Re: Auto-kerning

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#125

From: Jeffrey H. Coffield
Date: Fri, 14 Nov 2008 02:45

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jdaw1 wrote:
>> Here is one public source for the kern table.
>>
>> http://ctan.binkerton.com/macros/text1/compugraphics_8600/etb.fontinfo
> 
> Wow, thank you. Do you know in what units are the kerning? That is,
> the line
>> kern W+A -54/10
> means I kern by -5.4 points at what point size?

On digging deeper (you got me curious) I realized that what you need is
the .afm (Adobe Font Metric) file. Putting that into Google leads to this:

http://github.com/sandal/prawn/tree/57cbf8cdb7df0108c7a8d0499937844d07ee4a26/data/fonts/Times-Bold.afm

The relevant entry here is KPX W A -120. This is in a 1000 unit
coordinate space like the rest of the font info so for a 100 point font
I get -120/1000 * 100 = -12.

This piece of postscript looks pretty good to me:

/Times-Bold 100 selectfont
100 100 moveto
{= = -12.0 0 rmoveto} (WA) kshow
showpage

Obviously some work would need to be done to convert the info in the
.afm file into what kshow needs. (I do Postscript on a contract
programming basis.)

Jeff Coffield
www.digitalsynergyinc.com

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Subject: Re: Auto-kerning
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