asciitopgm man page on Oracle

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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.	 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; 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 + (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

       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. (

netpbm documentation		20 January 2011	     Asciitopgm User Manual(0)

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