NAME

       ppmrough - create PPM image of a single color rectangle with ragged edges on a different color background

SYNOPSIS

       ppmrough

       [-left pixels]

       [-right pixels]

       [-top pixels]

       [-bottom pixels]

       [-width pixels]

       [-height pixels]

       [-bg colorspec]

       [-fg colorspec]

       [-var pixels]

       [-randomseed seed]

       [-verbose]

       All  options can be abbreviated to their shortest unique prefix.  You may use two hyphens instead of one.
       You may separate an option name and its value with white space instead of an equals sign.

DESCRIPTION

       This program is part of Netpbm(1).

       ppmrough generates a PPM image of the specified width and height.
         The image consists of a rectangle of the specified foreground color
         surrounded by borders of the specified size and background color, except
         that the boundary between the foreground rectangle and the borders is
         ragged.  The ragged effect is random.

       ppmrough writes the PPM image to Standard Output.

       The maxval of the output image is 255 (You can change this with pamdepth).

       Use the options  -left  or  -right,  respectively,  to  make  vertical  borders,  and  -top  or  -bottom,
       respectively, to generate horizontal borders inside the image.  The value of each of these options is the
       minimum  width  of the border on that edge.  Beyond that minimum, the width at any given location on that
       edge is random, varying along the edge in a fractal kind of way.

       Use the -var option to control the "raggedness" of the border.  The lower its  value,  the  smoother  the
       border is.  You can initialize the pseudo-random generator with the -init option.

       You could use ppmrough with ppmtopgm to create a PGM transparency mask and use it to roughen up the edges
       of another image.

OPTIONS

       In  addition  to  the options common to all programs based on libnetpbm (most notably -quiet, see  Common
       Options ), ppmrough recognizes the following command line options:

       -width=pixels
              This specifies the width of the image in pixels (default: 100).

       -height=pixels
              This specifies the height of the image in pixels (default: 100).

       -left=pixels

       -right=pixels

       -top=pixels

       -bottom=pixels
              This option causes the program to create a left, right, top, or bottom  border,  respectively,  at
              least pixels pixels wide, varying randomly beyond that.  You may specify any combination of these.

       -bg=colorspec
              This  is  the  background color, i.e. the color of the borders.  colorspec is as described for the
              argument of the pnm_parsecolor() library routine .  Default is black.

       -fg=color
              This specifies the foreground color, i.e. the color of the center of the mage  --  everything  but
              the borders.  colorspec is as described for the argument of the pnm_parsecolor() library routine .
              Default is white.

       -var=pixels
              This  specifies  how ragged the borders are -- how much and how quickly its width varies along the
              image edge.  Its specific meaning is complex, but the larger it is, the more  the  border  varies.
              Zero means it does not vary at all -- the edge of the foreground is straight.

              This must be a nonnegative integer.  The default is 10.

       -randomseed=seed
              Use this option to initialize the pseudo-random number generator with seed.

              You can use this to cause the program to produce repeatable output.

              Before Netpbm 10.61 (December 2012), this is called -init, and that still works.

       -verbose
              Run ppmrough in verbose mode.  It reports all parameters on Standard Error.

SEE ALSO

       ppmmake(1), pamcat(1), ppmtopgm(1), ppm(1),

HISTORY

       This program was added to Netpbm in Release 10.9 (September 2002).

AUTHOR

       Copyright (C) 2002 by Eckard Specht.

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/ppmrough.html

netpbm documentation                             20 August 2023                          Ppmrough User Manual(1)