pgmnoise - Man Page

create a PGM image made up of white noise


pgmnoise width height

[-maxval=n] [-randomseed=integer]

Minimum unique abbreviations of option are acceptable.  You may use double hyphens instead of single hyphen to denote options.  You may use white space in place of the equals sign to separate an option name from its value.


This program is part of Netpbm(1).

pgmnoise creates a PGM image that is made up of pixels of random brightness.

You specify the dimensions of the image with the width and height arguments.

The randomness in the image is limited before Netpbm 10.37 (December 2006) -- if you run the program twice in the same second, you may get identical output.


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


The maxval of the generated image.

Default is 255.

This option was new in Netpbm 10.63 (June 2013).


This is the seed for the random number generator that generates the pixels.

Use this to ensure you get the same image on separate invocations.

By default, pgmnoise uses a seed derived from the time of day and process ID, which gives you fairly uncorrelated results in multiple invocations.

This option was new in Netpbm 10.45 (December 2008).

See Also


Copyright (C) 1993 by Frank Neumann

Document Source

This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master documentation is at

Referenced By

pamaddnoise(1), pbmnoise(1), pgmmedian(1).

27 June 2013 netpbm documentation