Asciitopgm User Manual(1) General Commands Manual Asciitopgm User Manual(1) NAME asciitopgm - convert ASCII graphics into a PGM SYNOPSIS asciitopgm [-d divisor] height width [asciifile] DESCRIPTION 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. For a lower case character, It assigns a special brightnesses which has noth- ing 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 pixels wide, truncating and padding with white on the right and bottom as necessary. The divisor value is an integer (decimal) by which the blackness of an input character is divided. 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 + (plus), asciitopgm combines it with the pre- vious 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 + meaning not at all, so that the rest of the charac- ters on the line overstrike the ones already on the paper. What asci- itopgm does is rather different in that asciitopgm does not reserve the first character of every line that way. If the first character is any- thing but +, asciitopgm considers 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 for that. OPTIONS In addition to the options common to all programs based on libnetpbm (most notably -quiet, see Common Options ⟨index.html#commonoptions⟩ ), asciitopgm recognizes the following command line option: -d divisor Specify the value by which the blackness of an input character is divided. This is an integer value. Default value is 1. Larger values produce darker output images. SEE ALSO pbmtoascii(1), pbmtext(1), pgm(1) AUTHOR Wilson H. Bent. Jr. (whb@usc.edu) DOCUMENT SOURCE This manual page was generated by the Netpbm tool 'makeman' from HTML source. The master documentation is at http://netpbm.sourceforge.net/doc/asciitopgm.html netpbm documentation 20 January 2011 Asciitopgm User Manual(1)
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