Hi, looking at the output of \setupbodyfont[libertinus] %\setupmathematics[stylealternative={ssty}] \starttext %\addff{ssty} $y'=f'$ \switchtobodyfont[newcomputermodernbook] $y'=f'$ \stoptext I think that the primes in libertinus are too small. Indeed, looking in the font, they look like the output. In lualatex* I get larger primes, and as far as I understand it is because unicodemath enables ssty. I was not able to do so with \addff{ssty} or with \setupmathematics[stylealternative={ssty}]. What do I miss? Best regards, Mikael *The file I used in lualatex was this: \documentclass{article} \usepackage{fontspec} \usepackage{unicodemath} \setmathfont{LibertinusMathRegular.otf} \begin{document} $u'f'$ \end{document}
On 10/20/2021 1:01 PM, Mikael Sundqvist via ntgcontext wrote:
Hi,
looking at the output of
\setupbodyfont[libertinus] %\setupmathematics[stylealternative={ssty}] \starttext %\addff{ssty} $y'=f'$ \switchtobodyfont[newcomputermodernbook] $y'=f'$ \stoptext
ssty doesn't kick in as we're in textstyle here (and even then \addff doesn't work in math mode; ssty is applied when we load a font, if at all because not all characters in a math font have a ssty feature definition)
I think that the primes in libertinus are too small. Indeed, looking in the font, they look like the output. In lualatex* I get larger primes, and as far as I understand it is because unicodemath enables ssty.
it's a design decision ... (imo the tex and math font community never could make up its mind about primes so it will always be a pain) .. looks like here the creator assumed a script design size for text size
I was not able to do so with \addff{ssty} or with \setupmathematics[stylealternative={ssty}]. What do I miss?
Best regards, Mikael
*The file I used in lualatex was this: \documentclass{article} \usepackage{fontspec} \usepackage{unicodemath} \setmathfont{LibertinusMathRegular.otf} \begin{document} $u'f'$ \end{document} whatever latex does to make these primes large is unlikely going to happen in context ... at some point, when these fonts stay as they are (all math fonts seem to have issues, but different ones) we can write font goodie files to 'fix them' at the font level, adding all kind of hacks to the context math handler is just stimulating 'not fixing a font'
\setupbodyfont[cambria] \starttext $y'=f'$ $\textstyle\prime$ $\scriptstyle\prime$ $\scriptscriptstyle\prime$ \switchtobodyfont[libertinus] $y'=f'$ $\textstyle\prime$ $\scriptstyle\prime$ $\scriptscriptstyle\prime$ \switchtobodyfont[newcomputermodernbook] $y'=f'$ $\textstyle\prime$ $\scriptstyle\prime$ $\scriptscriptstyle\prime$ \stoptext  Hans Hagen  PRAGMA ADE Ridderstraat 27  8061 GH Hasselt  The Netherlands tel: 038 477 53 69  www.pragmaade.nl  www.pragmapod.nl 
participants (2)

Hans Hagen

Mikael Sundqvist