~F8IV. USING TVFONT - draft.

Introduction.

	TVFONT  is  a   version  of  CRE  (January  1973)   that  was
specialized  to the  task of converting  television images  into type
fonts for the XGP,  Xerox Graphics Printer. The original idea  was to
demonstrate  the utility  of  a polygon  representation for  scaling,
smoothing  and  editing  typographical  glyphs;  the  resulting  hack
(demonstration program)  was  extended and  developed  by Tovar  Mock
into the program called  TVFONT. Accordingly, the main idea of TVFONT
is to convert  video rasters  into polygons,  to edit  and scale  the
polygons, and to convert the polygons back into bit rasters.

	This section IV,  will be available  as a TVFONT  user manual
in  another six  months; it is  presented here  to give the  would be
user a  start, and  the general  reader a  sample of  the design  and
extent of TVFONT.

	The  figure  on  page 41  is  an  example  of  expanding  and
contracting a font  without manual touching up. The top sample is the
original (BDR40  from  CMU). The  remainder  have been  generated  by
TVFONT. The  expansion or  contraction was  done by  converting fonts
from  bit matrices into  a polygonal representation,   multiplying by
the  appropriate   constant  and   reconverting  back   into  a   bit
representation. The following paragraph  is an example of a font made
from television pictures:

~I1973,800;F8- 42 -