Recent versions of InDesign, Illustrator, and Photoshop shipped with several “concept” fonts including Acumin Variable Concept, Myriad Variable Concept, Minion Variable Concept, and Trajan Color Concept.
The “variable concept” fonts are OpenType Variable CFF2 fonts, somewhat of a latter day resurrection of Multiple Master fonts. As you would expect, there are two flavours of OpenType Variable fonts. OpenType Variable CFF2 fonts have Bezier outlines (similar to OpenType CFF and Type 1 fonts) and OpenType Variable TTF fonts have quadratic outlines (sinilar to OpenType TTF and TrueType fonts).
Microsoft has already released an OpenType Variable TTF font, Banschrift. A number of Google fonts are also available in OpenType Variable TTF format.
The Trajan Color Concept font is an OpenType SVG CFF font that provides “color fonts” capability (using SVG definitions) with a fallback to standard OpenType CFF glyph definitions for applications and systems that don't support the SVG glyph definitions. You can also find both commercial and “free” OpenType SVG TTF fonts from various internet sites.
Note that neither OpenType Variable nor OpenType SVG fonts are directly supported in PDF at this point. A quite major update to the PDF specification (oh no, not again) would be necessary for such support. In the meantime, applications that support OpenType Variable fonts (either or both flavours) create PDF files with embedded “instances” of those fonts. Applications that support OpenType SVG fonts create PDF files with PDF “Type 3” glyph definitions in order to allow mixtures of vector and raster as well as multiple colours in a glyph.
There are several problems here, to say the least. Although Microsoft claims support for OpenType Variable CFF2 fonts in Windows, in fact, even installing same outside of the CC applications will cause Windows' character display system to effectively crash, requiring at best, logging off and logging back on or possibly a full system reboot if you even try to use the font display capability for such fonts under the Fonts Control panel.
Microsoft Office (using either Microsoft's own “save as PDF” or Acrobat's PDFMaker) cannot properly create PDF from documents using any OpenType Variable font; nor can it properly print such documents to certain print drivers, including the standard Windows PSCRIPT5.DRV PostScript driver. Nor is it easy to properly select such fonts and apply said font styles to text in Microsoft applications. In terms of OpenType SVG fonts, Microsoft Office applications ignore the SVG glyph definitions entirely.
We do not yet have either a time schedule or even a committment yet from Microsoft as to when the above issues may be resolved.
I have done limited experiments with these fonts with Microsoft Office under MacOS, but I've seen some “anomolies” that lead me to shy away from such fonts. Apple does not currently ship any OpenType Varaible or OpenType SVG fonts with MacOS.
Bottom line? Neither OpenType Variable nor OpenType SVG fonts are quite ready for prime time yet and certainly not for any production use!
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