Manual: ppmrough

Ppmrough User Manual(1)				   General Commands Manual			     Ppmrough User Manual(1)

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 gener‐
       ate 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)