User Guide

FontLab 4
590
Simple formulas are used to make these calculations and as a result we get
an array of values that define the “weight” of each master in the final
interpolation that produces an intermediate font:
[0.13, 0.77] - for a one-axis font (two masters are blended)
[0.02, 0.24, 0.11, 0.63] - for a two-axis font (four masters are blended)
Note that the sum of all weights is always equal to 1.
This array of masters’ weights is called the weight vector and is used
internally by the font interpreter to build the intermediate font. Note that
while blend coordinates are used internally, externally, design coordinates
are used.
A special weight vector, called the default weight vector, should be set in
the font header to define a standard intermediate design of the MM font. A
MM font is “seen” as a typical Type 1 font by a PostScript device or
program, and this Type 1 font is an intermediate instance of the MM font
with the default weight vector.