On Tue, Aug 04, 2020 at 08:20:54PM -0500, Dave Kemper wrote: > Subject: Re: Groff vs Heirloom troff (was Re: Quick question: how to do > .index in groff?) > > On 7/31/20, Steve Izma <si...@golden.net> wrote: > > When I adjust the kerning (or mortising, if necessary) > > in values of one-hundredth or one-thousandth of a point, > > Everything I've found online says that mortising is another (less > common) term for kerning, but you're using them here as if they're > different processes. What's the distinction between them?
In the 1980s, based on hearsay, I started to distinguish between positive and negative letterspacing with "mortising" and "kerning". Prior to that, I was in the habit of just using "kerning". This was at the point that about six of us around the University of Waterloo started up Mortice Kern Systems (which became MKS Inc.), supposedly to develope a typesetting system (we never did). But, prompted by your message, I tried to find other references to it, to no avail. I regard Robert Bringhurst as the expert in the history and theory of these things and he appears not to use the term "mortising", using "letterspacing" in such cases, and he seems to restrict the use to slight increases of letterspacing to words set in small caps. He also seems to restrict the idea of kerning to letterfitting, i.e., only between pairs of letters and almost always as a negative value. He's fairly explicit about considering any kind of track kerning to be poor typography. But I don't thing that's a practical position in my work. Bringhurst has extremely good ideas about "rhythm and proportion" and "harmony and contrast" in the appearance of a page and how this affects readability. I think one can maintain these principles with careful attention to track kerning across a paragraph (and, of course, sometimes across a page). In a production situation, where the typographer is often under pressure to produce pages quickly, I think track kerning (or mortising) is an essential tool, but you always need to look closely at the results. -- Steve -- Steve Izma - Home: 35 Locust St., Kitchener, Ontario, Canada N2H 1W6 E-mail: si...@golden.net phone: 519-745-1313 cell (text only; not frequently checked): 519-998-2684 == I have always felt the necessity to verify what to many seemed a simple multiplication table. -- Ilya Ehrenburg (Soviet author and critic; he's not talking about mathematics)