asciitopgm(1): - convert ASCII graphics into a portable graymap

NAME

   asciitopgm - convert ASCII graphics into a portable graymap

SYNOPSIS

   asciitopgm [-d divisor] height width [asciifile]

DESCRIPTION

   Reads  ASCII  data  as  input.   Produces a portable graymap with pixel
   values which are an approximation of  the  "brightness"  of  the  ASCII
   characters,  assuming  black-on-white  printing.   In  other  words,  a
   capital M is very dark, a period is ver light, and a  space  is  white.
   Input  lines  which  are  fewer than width characters are automatically
   padded with spaces.

   The divisor argument is a floating-point number  by  which  the  output
   pixels  are  divided;  the  default  value is 1.0.  This can be used to
   adjust the brightness of the graymap: for example, if the image is  too
   dim, reduce the divisor.

   In  keeping  with  (I  believe) Fortran line-printer conventions, input
   lines beginning with a + (plus) character are assumed  to  "overstrike"
   the previous line, allowing a larger range of gray values.

   This  tool contradicts the message in the pbmtoascii manual: "Note that
   there is no asciitopbm tool - this transformation is one-way."

BUGS

   The table of ASCII-to-grey values is subject to interpretation, and, of
   course, depends on the typeface intended for the input.

AUTHOR

   Wilson H. Bent. Jr. (whb@usc.edu)

                           26 December 1994                  asciitopgm(1)

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