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.)   FSCALE then  asks for  the desired  change  in
aspect ratio (if any).  Answering 2 (for instance) will generate a  font
which is twice as "fat" as  the original, i.e. whose width/height  ratio
is doubled.  The change in aspect may be any positive real value.  If  a
non-positive (or null) value is given, a default of 1.0 is assumed.

If neither the  height nor  the aspect  ratio is  being changed,  FSCALE
still 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.)  This process  is much  faster than  an
actual scaling operation.  Also, if neither the height nor aspect  ratio
is changed,  FSCALE  offers  to  "thicken"  the  font  by  "or"ing  each
character with a shifted copy of itself.  This thickening can be done in
either or both dimensions.

If the  height or  aspect ratio  IS  being changed,  FSCALE 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.