User Guide

Now, however, we will apply this slightly changed set of
kerning equivalence classes:
The only difference is that the “T” and “W” are no longer
linked together. This time, nothing has been changed
for “To” or “Wa;” after all, “T” and “W” are not linked.
The “a” and the “o” are, however, and so Fontographer has
gone ahead and created the “Ta” and “Wo” pairs:
Note that this time, the values of “Ta” and “Wo” are not
the same.
In summary, we began with To = -150, Wa = -100. We
ended with To = Ta = -150, and Wa = Wo = -100. This
class sort of says “anything-with-o will be equal to that-
same-anything-with-a.”
Now let’s try one more permutation. We’ll again start from
scratch, with our trusty old “To” and “Wa” pairs:
Now we’ll unlink “a” and “o”, but link “T” and “W.” That
gives us these two classes:
When we apply this set of classes, it again does nothing to
the “To” and “Wa” pairs. However, Fontographer did go
ahead and create the “Ta” and “Wo” pairs:
Fontographer User's Manual
5: Metrics: Spacing and Kerning Page #27