> Most fonts are usually defined relative to a resolution of a
> 1000em-unit scale,
Normally used for third-order Bézier outlines (Type1, CFF).
> a 1024em-unit scale or a 2048em-unit scale.
Normally used for second-order Bézier outlines (TrueType).
Note that this is really a convenience thing, as Abraham has already
stated. You can find TrueType fonts that use 1000upem (units per EM)
as the designsize, and some CJK fonts use 256upem to make the font
smaller.
Werner
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