Manual: pamtooctaveimg

Pamtooctaveimg User Manual(1)			   General Commands Manual		       Pamtooctaveimg User Manual(1)

NAME
       pamtooctaveimg - convert a Netpbm image to a GNU Octave image

SYNOPSIS
       pamtooctaveimg [netpbmfile]

DESCRIPTION
       This program is part of Netpbm(1).

       pamtooctaveimg reads a Netpbm image as input and produces a GNU Octave  image file as output.

       An  Octave  image  file	(called "Octave's image format" in Octave documentation) is a particular kind of Octave data
       file.  It describes two matrices:

       •      the image itself as a list of indexes into a colormap, and

       •      the corresponding colormap as a list of {red, green, blue} triplets.

       An Octave data file is an ASCII text file that you use to import data to Octave.

       See the	Image Processing chapter  of the GNU Octave manual for details.

       pamtooctaveimg writes the output Octave image to Standard Output.

OPTIONS
       There are no command line options defined specifically for pamtooctaveimg, but it recognizes the	 options  common  to
       all programs based on libnetpbm (See  Common Options .)

ARGUMENTS
       netpbmfile  is  the  name of the file containing the input PNM or PAM image, or - to indicate Standard Input.  If you
       don't specify netpbmfile, the input is from Standard Input.  pamtooctaveimg converts only the first image in the	 in‐
       put stream.

EXAMPLES
	  % pamtooctaveimg myimage.ppm > myimage.img
	  % octave
	  > [img,map] = loadimage("myimage.img");

	  # (At this point, img is an X by Y matrix and map is a 3 by M matrix.)

	  > imshow(img,map);   # Displays img with colormap map
	  > [r,g,b] = ind2rgb(img,map);

	  # (r, g, and b are now each X by Y matrices of color levels [0 to 1].)

	  > [newimg,newmap] = rgb2ind(r,b,g);	# Swap the blue and green channels.
	  > saveimage("newimage.ppm", newimg, "ppm", newmap);  # Save as a PPM file.

NOTES
       There is no octavetopam program.	 However, GNU Octave's saveimage command can save images in PPM format.

HISTORY
       pamtooctaveimg was new in Netpbm 10.39 (June 2007).

AUTHOR
       Copyright (C) 2007 Scott Pakin, scott+pbm@pakin.org.

SEE ALSO
       octave(1), pam(1).

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/pamtooctaveimg.html

netpbm documentation					27 June 2007			       Pamtooctaveimg User Manual(1)