[NTG-context] Broken kerning if hz is turned on?

Mikael P. Sundqvist mickep at gmail.com
Sun Jun 2 08:36:12 CEST 2019


On Mon, May 20, 2019 at 9:55 PM Wolfgang Schuster <
wolfgang.schuster.lists at gmail.com> wrote:

> Mikael P. Sundqvist schrieb am 20.05.2019 um 21:41:
> > Hi,
> >
> > attached is the result of running latest lmtx on
> >
> >
> \definefontfeature[default][default][protrusion=quality,expansion=quality]
> \definefontfeature [default] [default] [threshold=20,expansion=quality]
> > \setupalign[hz]
> > \setupbodyfont[lucidaot]
> >
> > \starttext
> > Gauss öppnade med denna studie ett helt nytt fält inom matematiken,
> > det som
> > handlar om \emph{elliptiska funktioner} och \emph{modulära former}.
> > \stoptext
> >
> > What happens with the space between the characters in "studie", that
> > becomes "s tudie"? The spacing between some other characters are also
> > off (ma tematiken), but not as much as in studie.
> It's a problem with Lucida Opentype which lacks kerning (I reported the
> same problem a while ago).
>
> Wolfgang
>
>

Hi,

thank you Wolfgang (I just realized I only sent my thank you to you
privately)!

Your threshold=20 solved that particular case. But look at the following
example:

\definefontfeature[default][default][threshold=20,protrusion=quality,expansion=quality,lnum=yes,itlc=yes]

\setupalign[hz,hanging,line,height]

\definebodyfontenvironment[9bp][interlinespace=12bp]
\setupbodyfont[lucidaot,9bp]

\starttext
Gränsvärde föreligger i en inre punkt i definitionsmängden om och endast
om höger- och vänstergränsvärde existerar där och är lika.
\stoptext

I attach the output (latest lmtx). The word "endast" shows up as "endas t".

So, what does this threshold do? I can play with the 20. If I change it to
5 it looks better here (not perfect), but my document is approx. 250 pages,
so, I fear it will break somewhere else...

I hope that this does not mean that the Lucida font turns out to be useless
:(

/Mikael
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