Asciitopgm User Manual(0) Asciitopgm User Manual(0)
asciitopgm - convert ASCII graphics into a PGM
asciitopgm [-d divisor] height width [asciifile]
This program is part of Netpbm(1).
asciitopgm reads ASCII data as input and produces a PGM image 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 very light, and a space is white.
Obviously, asciitopgm assumes a certain font in assigning a brightness
value to a character.
asciitopgm considers ASCII control characters to be all white. It
assigns special brightnesses to lower case letters which have nothing
to do with what they look like printed. asciitopgm takes the ASCII
character code from the lower 7 bits of each input byte. But it warns
you if the most signficant bit of any input byte is not zero.
Input lines which are fewer than width characters are automatically
padded with spaces.
The divisor value is an integer (decimal) by which the blackness of an
input character is divided; the default value is 1. You can use this
to adjust the brightness of the output: for example, if the image is
too bright, increase 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.
If you’re looking for something that creates an image of text, with
that text specified in ASCII, that is something quite different. Use
pbmtext for that.
pbmtoascii(1), pbmtext(1), pgm(1)
Wilson H. Bent. Jr. (email@example.com)
netpbm documentation 05 September 2003 Asciitopgm User Manual(0)
Man(1) output converted with