[XeTeX] Fonts with unusual (non-1000) upm sizes

Adam Twardoch list.adam at twardoch.com
Fri Oct 17 16:09:35 CEST 2008

Andrew Moschou wrote:
> I believe the normal units per em number depends on the font format.
> Type 1 fonts tend to have 1000, and TrueType fonts tend to have 2048.

Type 1 fonts tend to have a UPM size of 1000, and there are applications
that actually assume that their UPM size is 1000 — including some Adobe
applications. The same is the case with OpenType PS (.otf) fonts.

OpenType TT (.ttf) fonts, formerly known as TrueType, typically have the
UPM size of either 1000 or 2048, but in reality can have UPM sizes up to
32,768, and no software I know makes any assumptions. There are a number
of TrueType-flavored fonts out there which have UPM sizes as different
as 20, 400, 1200 and 16000.



Adam Twardoch
| Language Typography Unicode Fonts OpenType
| twardoch.com | silesian.com | fontlab.net

I hate to advocate drugs, alcohol, violence, or
insanity to anyone, but they've always worked for me.
(Hunter S. Thompson)

More information about the XeTeX mailing list