pamtooctaveimg(1) - phpMan

Pamtooctaveimg User Manual(0)                                       Pamtooctaveimg User Manual(0)



       " "netpbm documentation"

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
       <http://www.octave.org/>  image file as output.

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



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

       o      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   <http://www.gnu.org/software/octave/doc/interpreter/Image-
       Processing.html#Image-Processing>  of the GNU Octave manual for details.

       pamtooctaveimg writes the output Octave image to Standard Output.


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.  pam-
       tooctaveimg converts only the first image in the input 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).



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


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

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

                                           27 June 2007             Pamtooctaveimg User Manual(0)

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