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Optical size information in Emmentaler-nn OpenType fonts


From: Urs Liska
Subject: Optical size information in Emmentaler-nn OpenType fonts
Date: Thu, 06 Sep 2012 14:48:58 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:15.0) Gecko/20120827 Thunderbird/15.0

Is there any information about optical sizes in the OpenType fonts used by LilyPond?
And if not, would it be complicated to add this?

To explain:
I have an Adobe OpenType font family containing its font faces in four sets: text, caption, subhead and display, each set designed for use at different point sizes.
I assume the different Emmentaler-nn fonts serve the same purpose.

If I use this Adobe font with LaTeX and fontspec it selects the right font automatically depending on the point size. E.g. if I write \scriptsize aText \huge anotherText LaTeX uses two fonts from the caption and the display set.

Is there something similar in the Emmentaler fonts or could this be easily included? I opened both fonts with FontForge but didn't find a setting that seems responsible, and I don't really know anything about the inner workings of OpenType (or any) font technologies.

However, I have to tell fontspec explicitely which Emmentaler font to use, I can't do anything like \fontspec{Emmentaler}.

Would it make sense to add this?
Or would it be an improvement that LilyPond (itself) doesn't need?

Best
Urs



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