On 6/2/2019 8:36 AM, Mikael P. Sundqvist wrote:
On Mon, May 20, 2019 at 9:55 PM Wolfgang Schuster
<wolfgang.schuster.li...@gmail.com
<mailto:wolfgang.schuster.li...@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 :(
Lucida does without kerning so where in other fonts we have more of less
tight boundingboxes + kerns, in lucida we have large side bearings and
in that case widening works out a bit different visually (thicker
vertical strokes as usual with hz + expanded built in side bearings),
definitely on screen.
Now, one thing that happens in the backend is that glyphs are output as
sequences and scaled as whole and occasionally the starting points get
synchronized .. this is what threshold deals with.
Anyway, I might improve thinsg over time as in context lmtx we have a
bit more control over matters.
One can argue if intercharacter kerns have to be stretched in other
cases but in context that is configureable.
Hans
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