FontLab TypoAscender and TypoDescender warning

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Måns Björkman's picture
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Joined: 12 May 2008 - 9:35am
FontLab TypoAscender and TypoDescender warning
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I'm surprised no-one has asked this before on Typophile (my search at least yielded no results). When generating fonts in FontLab I often get the message:

[WARNING] The feature file OS/2 overrides TypoAscender and TypoDescender do not sum to the font bbox size!

I assume this has to do with the metrics settings somehow, but no matter how I play around with the metrics this message won't go away.

O ye wise, what is wrong, how did I cause it, and how do I make it go away?

Cristobal Henestrosa's picture
Joined: 24 May 2005 - 7:36am
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It has been asked many times, but the Search function is not working properly at this moment. Try in Google. A related thread here: http://typophile.com/node/20429.

Måns Björkman's picture
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Joined: 12 May 2008 - 9:35am
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Christobal, thanks! I thought I had seen it somewhere.

Nick Curtis's picture
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Joined: 21 Apr 2005 - 8:16am
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The referenced thread notwithstanding, in my experience the message goes away if, on the "Most important font dimensions" page, simply make the Ascender and the Descender AS A POSITIVE value equal the UPM (e.g., 750+250=1,000), then check the "Copy values to TrueType metrics" box, then hit "Apply." Don't ask me why, but it works every time.