Ppmrough User Manual(0) Ppmrough User Manual(0)NAMEppmrough - create PPM image of two colors with a ragged border between
them
SYNOPSISppmrough
[-left pixels]
[-right pixels]
[-top pixels]
[-bottom pixels]
[-width pixels]
[-height pixels]
[-bg rgb:##/##/##]
[-fg rgb:##/##/##]
[-var pixels]
[-init 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, height, and col‐
ors. ppmrough tiles the image into semi-rectangular regions with a
ragged borders between them. It calculates the fluctuations with the
rand() standard C library function.
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 bor‐
ders, and -top or -bottom, respectively, to generate horizontal borders
inside the image. Each of these options needs an integer value pixels
that determines the average distance of the interior border to the
related edge of the image. You may combine the -left, -right, -top,
and -bottom options to generate an image with more than one border.
The algorithm ensures that you can concatenate two images produced with
the same (i.e. -left) value without dislocations.
You specify the dimensions of the generated image with the -width and
-height options.
Use the -bg and -fg options to set the background (margin) color and
the foreground (interior) color, respectively. If you don't specify
any of the -left, -right, -top, and -bottom options, all pixels are set
to foreground color. The defaults are white foreground and black back‐
ground.
Use the -var option to control the 'raggedness' of the border. The
less its value is 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 alpha mask and use
it to roughen up the edges of another image.
OPTIONS-left pixels
Specifies the mean distance of the border from the left margin
(default: no border).
-right pixels
Specifies the mean distance of the border from the right margin
(default: no border).
-top pixels
Specifies the mean distance of the border from the top margin
(default: no border).
-bottom pixels
Specifies the mean distance of the border from the bottom margin
(default: no border).
-width pixels
Specifies the width of the image (default: 100).
-height pixels
Specifies the height of the image (default: 100).
-bg color
Background color. Specify this the same way you specify a color
with
ppmmake. Default is black.
-fg color
Foreground color. Specify this the same way you specify a color
with
ppmmake. Default is white.
-var pixels
Specifies the variance of the ragged border (default: 10). Must
be a positive integer. Set pixels to 1 to get a straight bor‐
der.
-init seed
Use this option to initialize the pseudo-random number generator
(the Standard C library rand() function) with seed.
-verbose
Run ppmrough in verbose mode. It reports all parameters on
Standard Error.
SEE ALSOppmmake(1), pnmcat(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.
netpbm documentation 23 August 2002 Ppmrough User Manual(0)
