On Tue, 03 Nov 2009 15:41:41 +0100, Invisible <voi### [at] devnull> wrote:
>
> Your point being...?

"In metal type, the point size (and hence the em) is measured as the  
height of the metal body from which the letter rises."

"In digital type, the relationship of the height of particular letters to  
the em is arbitrarily set by the typeface designer. However, as a very  
rough guideline, an 'average' font might have a cap height of 70% of the  
em, and an x-height of 48% of the em."


> Last time I checked, PostScript measures everything in points.

With the "point size" corresponding to the em. In a 10pt font, one em  
equals 10 points. The actual height of most letters will be smaller.



-- 
FE

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