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This program is part of
Netpbm(1).
ppmrough generates a PPM image of the specified width, height, and
colors. 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 borders, 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 background.
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.
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