asciitopgm - convert ASCII graphics into a PGM
[ -d divisor
] height width
This program is part of Netpbm(1)
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.
assumes a certain font in assigning a brightness
value to a character.
considers ASCII control characters to be all white. For a
lower case character, It assigns a special brightnesses which has nothing to
do with what it looks like printed. asciitopgm
takes the ASCII
character code from the lower 7 bits of each input byte. But it warns you if
the most significant bit of any input byte is not zero.
The output image is height
pixels high by width
truncating and padding with white on the right and bottom as necessary.
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 a sort of reminiscence of Fortran line printer carriage control, where a line
starts with +
combines it with the previous
row of output instead of generating a new row. This allows a larger range of
gray values. (In Fortran carriage control, the first character of every line
sent to the printer tells how much to advance the paper, with +
not at all, so that the rest of the characters on the line overstrike the ones
already on the paper. What asciitopgm
does is rather different in that
does not reserve the first character of every line that way.
If the first character is anything but +
it just to be first character of the image.
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
Wilson H. Bent. Jr. ( email@example.com