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RedHat 9 (Linux i386) - man page for asciitopgm (redhat section 1)

asciitopgm(1)						      General Commands Manual						     asciitopgm(1)

asciitopgm - convert ASCII graphics into a portable graymap
asciitopgm [-d divisor] height width [asciifile]
Reads ASCII data as input. Produces a portable graymap with pixel values which are an approximation of the "brightness" of the ASCII char- acters, 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."
The table of ASCII-to-grey values is subject to interpretation, and, of course, depends on the typeface intended for the input.
pbmtoascii(1), pgm(5)
Wilson H. Bent. Jr. ( 26 December 1994 asciitopgm(1)