FSCALE scales fonts.   It asks for  input and output  font file  names
(with the  usual  default  extension/directory), then  tells  you  the
height of the input font and asks for the desired height of the output
font.  The default is no change, in which case FSCALE merely optimises
the format of  the file to  save any  space it can.   (E.g., it  trims
empty columns off the right using character width and raster width  to
get the same effect.)  FSCALE also  asks for a threshhold, which  must
be between 0 and  1.  The default  is .5, and  typically it should  be
between .45 and .55.

FSCALE works  by  mapping each  point  of  the scaled  font  onto  the
original  font,  and  computing  the  weighted  average  of  the  four
surrounding points.  If this weighted average is above the threshhold,
the point is made dark in the new font.