FontLab TypoAscender and TypoDescender warning

Mans's picture

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

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.

Mans's picture

Christobal, thanks! I thought I had seen it somewhere.

oldnick's picture

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.

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