ConTeXt: How to use font optical sizes

Question

I have a font with some optical sizes which I want to use. I tried two solutions (below), without success. How can I use optical sizes of a local font? The solutions I tried:

1. Using \definefontfamily, which gave me correct basic alternatives (italics, bold etc.) and correctly converted --- to em-dashes, but doesn't support changing font according to size (as I understood from the docs).

2. Using typescripts, which didn't give me correct alternatives (more below) nor converted --- to em-dashes. I was not capable to understand how to configure optical sizes this way (although it seems to be the recommended way).

With typescripts, regular italics were converted to semibold italics. I put semibold declarations on typescript, but not in regular italics. My typescript declaration and usage:

\definebodyfontenvironment[default][em=italic]
\definebodyfontenvironment[12pt][interlinespace=4.2ex]
\definebodyfontenvironment[10pt][interlinespace=3.2ex]

\starttypescript [serif] [garamond]
  \setups [font:fallback:serif]
  \definefontsynonym [Garamond-Regular]         [name:Garamond Premier Pro Regular]
  \definefontsynonym [Garamond-Italic]          [name:Garamond Premier Pro Italic]
  \definefontsynonym [Garamond-Medium]          [name:Garamond Premier Pro Medium]
  \definefontsynonym [Garamond-Semibold]        [name:Garamond Premier Pro Semibold]
  \definefontsynonym [Garamond-Bold]            [name:Garamond Premier Pro Bold]
  \definefontsynonym [Garamond-MediumItalic]    [name:Garamond Premier Pro Medium Italic]
  \definefontsynonym [Garamond-SemiboldItalic]  [name:Garamond Premier Pro Semibold Italic]
  \definefontsynonym [Garamond-BoldItalic]      [name:Garamond Premier Pro Bold Italic]
\stoptypescript

\starttypescript [serif] [garamond]
  \definefontsynonym [Serif]                [Garamond-Regular]
  \definefontsynonym [SerifItalic]          [Garamond-Italic]
  \definefontsynonym [SerifSlanted]         [Garamond-Italic]
  \definefontsynonym [SerifMedium]          [Garamond-Medium]
  \definefontsynonym [SerifSemibold]        [Garamond-Semibold]
  \definefontsynonym [SerifBold]            [Garamond-Bold]
  \definefontsynonym [SerifMediumItalic]    [Garamond-MediumItalic]
  \definefontsynonym [SerifSemiboldItalic]  [Garamond-SemiboldItalic]
  \definefontsynonym [SerifBoldItalic]      [Garamond-BoldItalic]
  \definefontsynonym [SerifBoldSlanted]     [Garamond-BoldItalic]
\stoptypescript

\starttypescript [garamond]
  \definetypeface   [garamond] [rm] [serif] [garamond] [default]
\stoptypescript

\usetypescript [serif] [garamond]
\usetypescript [garamond]
\setupbodyfont [garamond, 12pt]

Thanks in advance!

Answer 1

You have to use font Goodies to use design sizes. Font Goodies are Lua scripts which return a table with extra information about the font and are loaded at runtime. More about Goodies can be found in chapter 5.4 “Goodies” in Fonts out of ConTeXt (PDF).

garamond-premier.lfg

return {
    name = "garamond-premier",
    version = "1.00",
    comment = "Goodies that complement Garamond Premier Pro.",
    author = "Adobe",
    copyright = "ConTeXt development team",
    designsizes = {
        ["GaramondPremier-Regular"] = {
            [ "4pt"] = "file:GaramondPremrPro-Capt.otf",
            [ "5pt"] = "file:GaramondPremrPro-Capt.otf",
            [ "6pt"] = "file:GaramondPremrPro-Capt.otf",
            [ "7pt"] = "file:GaramondPremrPro.otf",
            [ "8pt"] = "file:GaramondPremrPro.otf",
            [ "9pt"] = "file:GaramondPremrPro.otf",
            ["10pt"] = "file:GaramondPremrPro.otf",
            ["11pt"] = "file:GaramondPremrPro.otf",
            ["12pt"] = "file:GaramondPremrPro.otf",
            ["13pt"] = "file:GaramondPremrPro-Subh.otf",
            ["14pt"] = "file:GaramondPremrPro-Subh.otf",
            ["15pt"] = "file:GaramondPremrPro-Subh.otf",
            ["16pt"] = "file:GaramondPremrPro-Subh.otf",
            ["17pt"] = "file:GaramondPremrPro-Subh.otf",
            ["18pt"] = "file:GaramondPremrPro-Subh.otf",
            ["19pt"] = "file:GaramondPremrPro-Subh.otf",
            ["20pt"] = "file:GaramondPremrPro-Disp.otf",
            ["21pt"] = "file:GaramondPremrPro-Disp.otf",
            ["22pt"] = "file:GaramondPremrPro-Disp.otf",
            default  = "file:GaramondPremrPro.otf",
        },
        ["GaramondPremier-Italic"] = {
            [ "4pt"] = "file:GaramondPremrPro-ItCapt.otf",
            [ "5pt"] = "file:GaramondPremrPro-ItCapt.otf",
            [ "6pt"] = "file:GaramondPremrPro-ItCapt.otf",
            [ "7pt"] = "file:GaramondPremrPro-It.otf",
            [ "8pt"] = "file:GaramondPremrPro-It.otf",
            [ "9pt"] = "file:GaramondPremrPro-It.otf",
            ["10pt"] = "file:GaramondPremrPro-It.otf",
            ["11pt"] = "file:GaramondPremrPro-It.otf",
            ["12pt"] = "file:GaramondPremrPro-It.otf",
            ["13pt"] = "file:GaramondPremrPro-ItSubh.otf",
            ["14pt"] = "file:GaramondPremrPro-ItSubh.otf",
            ["15pt"] = "file:GaramondPremrPro-ItSubh.otf",
            ["16pt"] = "file:GaramondPremrPro-ItSubh.otf",
            ["17pt"] = "file:GaramondPremrPro-ItSubh.otf",
            ["18pt"] = "file:GaramondPremrPro-ItSubh.otf",
            ["19pt"] = "file:GaramondPremrPro-ItSubh.otf",
            ["20pt"] = "file:GaramondPremrPro-ItDisp.otf",
            ["21pt"] = "file:GaramondPremrPro-ItDisp.otf",
            ["22pt"] = "file:GaramondPremrPro-ItDisp.otf",
            default  = "file:GaramondPremrPro-It.otf",
        },
        ["GaramondPremier-Bold"] = {
            [ "4pt"] = "file:GaramondPremrPro-BdCapt.otf",
            [ "5pt"] = "file:GaramondPremrPro-BdCapt.otf",
            [ "6pt"] = "file:GaramondPremrPro-BdCapt.otf",
            [ "7pt"] = "file:GaramondPremrPro-Bd.otf",
            [ "8pt"] = "file:GaramondPremrPro-Bd.otf",
            [ "9pt"] = "file:GaramondPremrPro-Bd.otf",
            ["10pt"] = "file:GaramondPremrPro-Bd.otf",
            ["11pt"] = "file:GaramondPremrPro-Bd.otf",
            ["12pt"] = "file:GaramondPremrPro-Bd.otf",
            ["13pt"] = "file:GaramondPremrPro-BdSubh.otf",
            ["14pt"] = "file:GaramondPremrPro-BdSubh.otf",
            ["15pt"] = "file:GaramondPremrPro-BdSubh.otf",
            ["16pt"] = "file:GaramondPremrPro-BdSubh.otf",
            ["17pt"] = "file:GaramondPremrPro-BdSubh.otf",
            ["18pt"] = "file:GaramondPremrPro-BdSubh.otf",
            ["19pt"] = "file:GaramondPremrPro-BdSubh.otf",
            ["20pt"] = "file:GaramondPremrPro-BdDisp.otf",
            ["21pt"] = "file:GaramondPremrPro-BdDisp.otf",
            ["22pt"] = "file:GaramondPremrPro-BdDisp.otf",
            default  = "file:GaramondPremrPro-Bd.otf",
        },
        ["GaramondPremier-BoldItalic"] = {
            [ "4pt"] = "file:GaramondPremrPro-BdItCapt.otf",
            [ "5pt"] = "file:GaramondPremrPro-BdItCapt.otf",
            [ "6pt"] = "file:GaramondPremrPro-BdItCapt.otf",
            [ "7pt"] = "file:GaramondPremrPro-BdIt.otf",
            [ "8pt"] = "file:GaramondPremrPro-BdIt.otf",
            [ "9pt"] = "file:GaramondPremrPro-BdIt.otf",
            ["10pt"] = "file:GaramondPremrPro-BdIt.otf",
            ["11pt"] = "file:GaramondPremrPro-BdIt.otf",
            ["12pt"] = "file:GaramondPremrPro-BdIt.otf",
            ["13pt"] = "file:GaramondPremrPro-BdItSubh.otf",
            ["14pt"] = "file:GaramondPremrPro-BdItSubh.otf",
            ["15pt"] = "file:GaramondPremrPro-BdItSubh.otf",
            ["16pt"] = "file:GaramondPremrPro-BdItSubh.otf",
            ["17pt"] = "file:GaramondPremrPro-BdItSubh.otf",
            ["18pt"] = "file:GaramondPremrPro-BdItSubh.otf",
            ["19pt"] = "file:GaramondPremrPro-BdItSubh.otf",
            ["20pt"] = "file:GaramondPremrPro-BdItDisp.otf",
            ["21pt"] = "file:GaramondPremrPro-BdItDisp.otf",
            ["22pt"] = "file:GaramondPremrPro-BdItDisp.otf",
            default  = "file:GaramondPremrPro-BdIt.otf",
        },
        ["GaramondPremier-Medium"] = {
            [ "4pt"] = "file:GaramondPremrPro-MedCapt.otf",
            [ "5pt"] = "file:GaramondPremrPro-MedCapt.otf",
            [ "6pt"] = "file:GaramondPremrPro-MedCapt.otf",
            [ "7pt"] = "file:GaramondPremrPro-Med.otf",
            [ "8pt"] = "file:GaramondPremrPro-Med.otf",
            [ "9pt"] = "file:GaramondPremrPro-Med.otf",
            ["10pt"] = "file:GaramondPremrPro-Med.otf",
            ["11pt"] = "file:GaramondPremrPro-Med.otf",
            ["12pt"] = "file:GaramondPremrPro-Med.otf",
            ["13pt"] = "file:GaramondPremrPro-MedSubh.otf",
            ["14pt"] = "file:GaramondPremrPro-MedSubh.otf",
            ["15pt"] = "file:GaramondPremrPro-MedSubh.otf",
            ["16pt"] = "file:GaramondPremrPro-MedSubh.otf",
            ["17pt"] = "file:GaramondPremrPro-MedSubh.otf",
            ["18pt"] = "file:GaramondPremrPro-MedSubh.otf",
            ["19pt"] = "file:GaramondPremrPro-MedSubh.otf",
            ["20pt"] = "file:GaramondPremrPro-MedDisp.otf",
            ["21pt"] = "file:GaramondPremrPro-MedDisp.otf",
            ["22pt"] = "file:GaramondPremrPro-MedDisp.otf",
            default  = "file:GaramondPremrPro-Med.otf",
        },
        ["GaramondPremier-MediumItalic"] = {
            [ "4pt"] = "file:GaramondPremrPro-MedItCapt.otf",
            [ "5pt"] = "file:GaramondPremrPro-MedItCapt.otf",
            [ "6pt"] = "file:GaramondPremrPro-MedItCapt.otf",
            [ "7pt"] = "file:GaramondPremrPro-MedIt.otf",
            [ "8pt"] = "file:GaramondPremrPro-MedIt.otf",
            [ "9pt"] = "file:GaramondPremrPro-MedIt.otf",
            ["10pt"] = "file:GaramondPremrPro-MedIt.otf",
            ["11pt"] = "file:GaramondPremrPro-MedIt.otf",
            ["12pt"] = "file:GaramondPremrPro-MedIt.otf",
            ["13pt"] = "file:GaramondPremrPro-MedItSubh.otf",
            ["14pt"] = "file:GaramondPremrPro-MedItSubh.otf",
            ["15pt"] = "file:GaramondPremrPro-MedItSubh.otf",
            ["16pt"] = "file:GaramondPremrPro-MedItSubh.otf",
            ["17pt"] = "file:GaramondPremrPro-MedItSubh.otf",
            ["18pt"] = "file:GaramondPremrPro-MedItSubh.otf",
            ["19pt"] = "file:GaramondPremrPro-MedItSubh.otf",
            ["20pt"] = "file:GaramondPremrPro-MedItDisp.otf",
            ["21pt"] = "file:GaramondPremrPro-MedItDisp.otf",
            ["22pt"] = "file:GaramondPremrPro-MedItDisp.otf",
            default  = "file:GaramondPremrPro-MedIt.otf",
        },
        ["GaramondPremier-Semibold"] = {
            [ "4pt"] = "file:GaramondPremrPro-SmbdCapt.otf",
            [ "5pt"] = "file:GaramondPremrPro-SmbdCapt.otf",
            [ "6pt"] = "file:GaramondPremrPro-SmbdCapt.otf",
            [ "7pt"] = "file:GaramondPremrPro-Smbd.otf",
            [ "8pt"] = "file:GaramondPremrPro-Smbd.otf",
            [ "9pt"] = "file:GaramondPremrPro-Smbd.otf",
            ["10pt"] = "file:GaramondPremrPro-Smbd.otf",
            ["11pt"] = "file:GaramondPremrPro-Smbd.otf",
            ["12pt"] = "file:GaramondPremrPro-Smbd.otf",
            ["13pt"] = "file:GaramondPremrPro-SmbdSubh.otf",
            ["14pt"] = "file:GaramondPremrPro-SmbdSubh.otf",
            ["15pt"] = "file:GaramondPremrPro-SmbdSubh.otf",
            ["16pt"] = "file:GaramondPremrPro-SmbdSubh.otf",
            ["17pt"] = "file:GaramondPremrPro-SmbdSubh.otf",
            ["18pt"] = "file:GaramondPremrPro-SmbdSubh.otf",
            ["19pt"] = "file:GaramondPremrPro-SmbdSubh.otf",
            ["20pt"] = "file:GaramondPremrPro-SmbdDisp.otf",
            ["21pt"] = "file:GaramondPremrPro-SmbdDisp.otf",
            ["22pt"] = "file:GaramondPremrPro-SmbdDisp.otf",
            default  = "file:GaramondPremrPro-Smbd.otf",
        },
        ["GaramondPremier-SemiboldItalic"] = {
            [ "4pt"] = "file:GaramondPremrPro-SmbdItCapt.otf",
            [ "5pt"] = "file:GaramondPremrPro-SmbdItCapt.otf",
            [ "6pt"] = "file:GaramondPremrPro-SmbdItCapt.otf",
            [ "7pt"] = "file:GaramondPremrPro-SmbdIt.otf",
            [ "8pt"] = "file:GaramondPremrPro-SmbdIt.otf",
            [ "9pt"] = "file:GaramondPremrPro-SmbdIt.otf",
            ["10pt"] = "file:GaramondPremrPro-SmbdIt.otf",
            ["11pt"] = "file:GaramondPremrPro-SmbdIt.otf",
            ["12pt"] = "file:GaramondPremrPro-SmbdIt.otf",
            ["13pt"] = "file:GaramondPremrPro-SmbdItSubh.otf",
            ["14pt"] = "file:GaramondPremrPro-SmbdItSubh.otf",
            ["15pt"] = "file:GaramondPremrPro-SmbdItSubh.otf",
            ["16pt"] = "file:GaramondPremrPro-SmbdItSubh.otf",
            ["17pt"] = "file:GaramondPremrPro-SmbdItSubh.otf",
            ["18pt"] = "file:GaramondPremrPro-SmbdItSubh.otf",
            ["19pt"] = "file:GaramondPremrPro-SmbdItSubh.otf",
            ["20pt"] = "file:GaramondPremrPro-SmbdItDisp.otf",
            ["21pt"] = "file:GaramondPremrPro-SmbdItDisp.otf",
            ["22pt"] = "file:GaramondPremrPro-SmbdItDisp.otf",
            default  = "file:GaramondPremrPro-SmbdIt.otf",
        },
    },
}

type-imp-garamond-premier.mkiv

\starttypescriptcollection[garamond-premier]

  \starttypescript [serif] [garamond-premier] [all]
    \loadfontgoodies[garamond-premier]
    \definefontsynonym [Serif]                [GaramondPremier-Regular]        [features=default,goodies=garamond-premier]
    \definefontsynonym [SerifItalic]          [GaramondPremier-Italic]         [features=default,goodies=garamond-premier]
    \definefontsynonym [SerifSlanted]         [SerifItalic]
    \definefontsynonym [SerifBold]            [GaramondPremier-Bold]           [features=default,goodies=garamond-premier]
    \definefontsynonym [SerifBoldItalic]      [GaramondPremier-BoldItalic]     [features=default,goodies=garamond-premier]
    \definefontsynonym [SerifBoldSlanted]     [SerifBoldItalic]
    \definefontsynonym [SerifMedium]          [GaramondPremier-Medium]         [features=default,goodies=garamond-premier]
    \definefontsynonym [SerifMediumItalic]    [GaramondPremier-MediumItalic]   [features=default,goodies=garamond-premier]
    \definefontsynonym [SerifMediumSlanted]   [SerifMediumItalic]
    \definefontsynonym [SerifSemibold]        [GaramondPremier-Semibold]       [features=default,goodies=garamond-premier]
    \definefontsynonym [SerifSemiboldItalic]  [GaramondPremier-SemiboldItalic] [features=default,goodies=garamond-premier]
    \definefontsynonym [SerifSemiboldSlanted] [SerifSemiboldItalic]
    \definefontsynonym [SerifCaps]            [Serif]                          [features=smallcaps]
  \stoptypescript

  \starttypescript [garamond-premier]
    \definetypeface [\typescriptone] [rm] [serif] [\typescriptone] [default] [designsize=auto]
    \definetypeface [\typescriptone] [ss] [sans]  [dejavu]         [default] [rscale=0.8]
    \definetypeface [\typescriptone] [tt] [mono]  [dejavu]         [default] [rscale=0.8]
    \definetypeface [\typescriptone] [mm] [math]  [dejavu]         [default] [rscale=0.8]
  \stoptypescript

\stoptypescriptcollection

You probably want to use a sans-serif, mono, and math font other than DejaVu. I just added them here for completeness. You should not leave any of these out because if you attempt to use them and they are not defined, strange things happen.

Font alternative can only have two letters, because ConTeXt will use anything after it as the size specifier, as the b in \tfb.

Then you can use this in your document via

\loadtypescriptfile[garamond-premier]

\definefontalternative[mf]
\definefontalternative[mi]
\definefontalternative[ms]
\definefontalternative[sf]
\definefontalternative[si]
\definefontalternative[ss]

\definebodyfont [default] [rm]
  [tf=Serif            sa 1,
   bf=SerifBold        sa 1,
   it=SerifItalic      sa 1,
   sl=SerifSlanted     sa 1,
   bi=SerifBoldItalic  sa 1,
   bs=SerifBoldSlanted sa 1,
   sc=SerifCaps        sa 1,
   %
   mf=SerifMedium        sa 1,
   mi=SerifMediumItalic  sa 1,
   ms=SerifMediumSlanted sa 1,
   %
   sf=SerifSemibold        sa 1,
   si=SerifSemiboldItalic  sa 1,
   ss=SerifSemiboldSlanted sa 1]
\stoptypescript

\setupbodyfont[garamond-premier]

\setuppapersize [A4,landscape]

\starttext

\dorecurse{22}{
  \switchtobodyfont[\recurselevel pt]
  \recurselevel\
  Regular
  \italic{Italic}
  \bold{Bold}
  \bolditalic{Bold italic}
  {\mf Medium}
  {\mi Medium italic}
  {\sf Semibold}
  {\si Semibold italic}
  \par
}

\stoptext

As you can see, this does not look really continuous. This is because I have guessed the values at which the different design sizes should be used. In production, one should carefully fine tune these to achieve a more continuous behaviour.

The output of pdffonts confirms that all fonts are embedded.

name                                 type              encoding         emb sub uni object ID
------------------------------------ ----------------- ---------------- --- --- --- ---------
EKDZXO+GaramondPremrPro-Capt         CID Type 0C       Identity-H       yes yes yes      4  0
HXIZMD+GaramondPremrPro-ItCapt       CID Type 0C       Identity-H       yes yes yes      5  0
YCEHGM+GaramondPremrPro-BdCapt       CID Type 0C       Identity-H       yes yes yes      6  0
LXMWZN+GaramondPremrPro-BdItCapt     CID Type 0C       Identity-H       yes yes yes      7  0
YSTBXJ+GaramondPremrPro-MedCapt      CID Type 0C       Identity-H       yes yes yes      8  0
UZWASV+GaramondPremrPro-MedItCapt    CID Type 0C       Identity-H       yes yes yes      9  0
BCZEUK+GaramondPremrPro-SmbdCapt     CID Type 0C       Identity-H       yes yes yes     10  0
ULHHSI+GaramondPremrPro-SmbdItCapt   CID Type 0C       Identity-H       yes yes yes     11  0
KYSIQC+GaramondPremrPro              CID Type 0C       Identity-H       yes yes yes     12  0
ZQKUVZ+GaramondPremrPro-It           CID Type 0C       Identity-H       yes yes yes     13  0
NEOZVY+GaramondPremrPro-Bd           CID Type 0C       Identity-H       yes yes yes     14  0
JHIVFR+GaramondPremrPro-BdIt         CID Type 0C       Identity-H       yes yes yes     15  0
EMFOVD+GaramondPremrPro-Subh         CID Type 0C       Identity-H       yes yes yes     16  0
DAPJGX+GaramondPremrPro-ItSubh       CID Type 0C       Identity-H       yes yes yes     17  0
NBZBXV+GaramondPremrPro-BdSubh       CID Type 0C       Identity-H       yes yes yes     18  0
EEPVVZ+GaramondPremrPro-BdItSubh     CID Type 0C       Identity-H       yes yes yes     19  0
DCVBES+GaramondPremrPro-MedSubh      CID Type 0C       Identity-H       yes yes yes     20  0
KRRICW+GaramondPremrPro-MedItSubh    CID Type 0C       Identity-H       yes yes yes     21  0
GNNEBG+GaramondPremrPro-SmbdSubh     CID Type 0C       Identity-H       yes yes yes     22  0
NOXUKA+GaramondPremrPro-SmbdItSubh   CID Type 0C       Identity-H       yes yes yes     23  0
OJMMRC+GaramondPremrPro-Disp         CID Type 0C       Identity-H       yes yes yes     24  0
CHNDOC+GaramondPremrPro-ItDisp       CID Type 0C       Identity-H       yes yes yes     25  0
MPPVHL+GaramondPremrPro-BdDisp       CID Type 0C       Identity-H       yes yes yes     26  0
MMQBOJ+GaramondPremrPro-BdItDisp     CID Type 0C       Identity-H       yes yes yes     27  0
AFGIHW+GaramondPremrPro-MedDisp      CID Type 0C       Identity-H       yes yes yes     28  0
VYQMOL+GaramondPremrPro-MedItDisp    CID Type 0C       Identity-H       yes yes yes     29  0
ZZMXKE+GaramondPremrPro-SmbdDisp     CID Type 0C       Identity-H       yes yes yes     30  0
LUNAOE+GaramondPremrPro-SmbdItDisp   CID Type 0C       Identity-H       yes yes yes     31  0

System-wide installation

For a system-wide installation you can put the files into appropriate locations in the ConTeXt tree. I just use the local tree within the ConTeXt installation. I show all the commands together with the output they produce on my machine. These might of course differ from yours.

First we get the path of the local tree and then we go there.

$ mtxrun --resolve-path '$TEXMFLOCAL'
/opt/context/tex/texmf-local
$ cd /opt/context/tex/texmf-local

Now we make a directory for the typescript files.

$ mkdir -p tex/context/fonts/mkiv/

In this new directory, create the two files garamond-premier.lfg and type-imp-garamond-premier.mkiv with the contents from above.

Now we make a directory for the OpenType font files. I follow the convention of the directory name scheme <foundry>/<fontname>.

$ mkdir -p fonts/opentype/adobe/garamond-premier/

Place all the OpenType files in there.

Because we have added new files to the tree, we have to rebuild the filename database. This is done using

$ mtxrun --generate

This will take a moment and print a lot of messages to the terminal. Afterwards, you can check whether the new files are detected in the tree

$ mtxrun --find-file garamond-premier.lfg
/opt/context/tex/texmf-local/tex/context/fonts/mkiv/garamond-premier.lfg
$ mtxrun --find-file type-imp-garamond-premier.mkiv
/opt/context/tex/texmf-local/tex/context/fonts/mkiv/type-imp-garamond-premier.mkiv
$ mtxrun --find-file GaramondPremrPro.otf
/opt/context/tex/texmf-local/fonts/opentype/adobe/garamond-premier/GaramondPremrPro.otf

If that all works, you are ready to typeset your document. The typescript should automatically found by \setupbodyfont[garamond-premier] (no \usetypescriptfile or similar necessary).