Section: User Commands (1)
Updated: 26 December 1994
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.
Wilson H. Bent. Jr. ([email protected])
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