Section: User Commands (1)
Updated: 26 December 1994Index
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asciitopgm - convert ASCII graphics into a portable graymap
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
characters are automatically padded with spaces.
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
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.
Wilson H. Bent. Jr. (firstname.lastname@example.org
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