[NTG-context] what defines the font size?

Pablo Rodriguez oinos at gmx.es
Tue Oct 16 19:48:41 CEST 2018

On 10/15/18 10:02 PM, Ulrike Fischer wrote:
> Am Mon, 15 Oct 2018 21:21:32 +0200 schrieb Pablo Rodriguez:
>> [...]
>> If two fonts have the same size, I think there may be a dimension which
>> has the same length in both. Which one is this?
> None. The font decides about its size. 

Many thanks for your clear statement, Ulrike.

Thomas Pinney explains why this might happen:

I cannot claim that I understand his explanation, but it seems that
there is something about the em quad, which might be something like:


            \framed{\tfxx M}
            \framed{\tfd M}

The square gives the points of the font (its size), but the glyphs might
be drawn in many different ways (I guess).

The issue with units per em is something I didn’t understand.

I tried to experiment (modifying TeX Gyre Pagella from 1000 to 9999
UPM), but for some reason, I wasn’t able to load the font.

Just in case anyone wonders, my code was standard:

        [TeX Gyre Pagella]

And the file was on the same directory as my ConTeXt source file.

Many thanks for your help,


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