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Re: [ft] Freetype vs. FontLab values for Linegap

From: Werner LEMBERG
Subject: Re: [ft] Freetype vs. FontLab values for Linegap
Date: Tue, 06 Jun 2006 16:45:50 +0200 (CEST)

> I need to investigate a value for a typographic line gap for a given
> font. With "sfnt" fonts I just open OS/2 table and use
> "os2->sTypoLineGap", but I have a problem when dealing with Type 1
> fonts.

A better forum might be the `opentype' or `fontforge' lists.

> For examples, for URW-Fonts which comes with Ghostscript I see 
> values like 
> TypoAscender     624
> TypoDescender    -205 
> LineGap          62   
> or similar numbers.
> Ascender and Descender corresponds to the values which I get from
> .afm file, but where on earth does FontLab take the value for
> LineGap from - like 59, 62, 67 etc.?

I think these values are educated guesses, based on a given algorithm.
Maybe FontLab people can answer this.

> Does Type 1 have some additional metrics info which I do not get
> with Freetype?



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