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| author | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2007-06-28 02:02:18 +0000 |
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| committer | giraffedata <giraffedata@9d0c8265-081b-0410-96cb-a4ca84ce46f8> | 2007-06-28 02:02:18 +0000 |
| commit | 5111fa2e7f490d7d34ae95b5a412e5a8a313a938 (patch) | |
| tree | 136c72c3c50acc6589d734887a86b8f27827b333 /pamtooctaveimg.html | |
| parent | 7f21e52f8ee6780de7332c3a96560847f9885b8b (diff) | |
| download | netpbm-mirror-5111fa2e7f490d7d34ae95b5a412e5a8a313a938.tar.gz netpbm-mirror-5111fa2e7f490d7d34ae95b5a412e5a8a313a938.tar.xz netpbm-mirror-5111fa2e7f490d7d34ae95b5a412e5a8a313a938.zip | |
"miscellaneous update"
git-svn-id: http://svn.code.sf.net/p/netpbm/code/userguide@336 9d0c8265-081b-0410-96cb-a4ca84ce46f8
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diff --git a/pamtooctaveimg.html b/pamtooctaveimg.html new file mode 100644 index 00000000..095f79a8 --- /dev/null +++ b/pamtooctaveimg.html @@ -0,0 +1,107 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> +<head> +<title>Pamtooctaveimg User Manual</title> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> +</head> + +<body> + +<h1>pamtooctaveimg</h1> + +<p>Updated: 27 June 2007<br /> +<a href="#index">Table Of Contents</a></p> + +<h2>NAME</h2> + +<p>pamtooctaveimg - convert a Netpbm image to a GNU Octave image</p> + +<h2 id="synopsis">SYNOPSIS</h2> + +<p><b>pamtooctaveimg</b> +[<i>netpbmfile</i>] + +<h2 id="description">DESCRIPTION</h2> + +<p>This program is part of <a href="index.html">Netpbm</a>.</p> + +<p><b>pamtooctaveimg</b> reads a Netpbm image as input and produces a <a +href="http://www.octave.org/">GNU Octave</a> image file as output. + +<p>An Octave image file (called "Octave's image format" in +Octave documentation) is a particular kind of Octave data file. It +describes two matrices: + +<ol> +<li>the image itself as a list of indexes into a colormap, and</li> +<li>the corresponding colormap as a list of {red, green, blue} triplets.</li> +</ol> + +<p>An Octave data file is an ASCII text file that you use to import data +to Octave. + +<p>See the <a +href="http://www.gnu.org/software/octave/doc/interpreter/Image-Processing.html#Image-Processing"> +Image Processing chapter</a> of the GNU Octave manual for details. + +<h2 id="arguments">Arguments</h2> + +<p><i>netpbmfile</i> is the name of the file containing the input PNM +or PAM image, or <b>-</b> to indicate Standard Input. If you don't +specify <i>netpbmfile</i>, the input is from Standard Input. +<b>pamtooctaveimg</b> converts only the first image in the input stream. +<b>pamtooctaveimg</b> writes the output Octave image to Standard Output. + + +<h2 id="examples">Examples</h2> + +<p> +<kbd> + % 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. +</kbd> + + +<h2 id="notes">NOTES</h2> + +<p>There is no <b>octavetopam</b> program. However, GNU Octave's +<b>saveimage</b> command can save images in PPM format.</p> + + +<h2 id="history">HISTORY</h2> + +<p><b>pamtooctaveimg</b> was new in Netpbm 10.39 (June 2007). + + +<h2 id="seealso">SEE ALSO</h2> + +<a +href="http://www.gnu.org/software/octave/doc/interpreter/index.html"><b>octave</b></a>, +<a href="pam.html"><b>pam</b></a>.</p> + +<hr /> + +<h2 id="index">Table Of Contents</h2> +<ul> +<li><a href="#synopsis">SYNOPSIS</a></li> +<li><a href="#description">DESCRIPTION</a></li> +<li><a href="#arguments">ARGUMENTS</a></li> +<li><a href="#examples">EXAMPLES</a></li> +<li><a href="#notes">NOTES</a></li> +<li><a href="#history">HISTORY</a></li> +<li><a href="#seealso">SEE ALSO</a></li> +</ul> +</body> +</html> + |