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+@c Copyright (C) 1996, 1997 John W. Eaton
+@c This is part of the Octave manual.
+@c For copying conditions, see the file gpl.texi.
+
+@node Image Processing, Audio Processing, Signal Processing, Top
+@chapter Image Processing
+
+Octave can display images with the X Window System using the
+@code{xloadimage} program.  You do not need to be running X in order to
+manipulate images, however, so some of these functions may be useful
+even if you are not able to view the results.
+
+Loading images only works with Octave's image format (a file with a
+matrix containing the image data, and a matrix containing the
+colormap).  Contributions of robust, well-written functions to read
+other image formats are welcome.  If you can provide them, or would like
+to improve Octave's image processing capabilities in other ways, please
+contact @email{bug-octave@@bevo.che.wisc.edu}.
+
+@deftypefn {Function File} {} colormap (@var{map})
+@deftypefnx {Function File} {} colormap ("default")
+Set the current colormap.
+
+@code{colormap (@var{map})} sets the current colormap to @var{map}.  The
+color map should be an @var{n} row by 3 column matrix.  The columns
+contain red, green, and blue intensities respectively.  All entries
+should be between 0 and 1 inclusive.  The new colormap is returned.
+
+@code{colormap ("default")} restores the default colormap (a gray scale
+colormap with 64 entries).  The default colormap is returned.
+
+With no arguments, @code{colormap} returns the current color map.
+@end deftypefn
+
+@deftypefn {Function File} {} gray (@var{n})
+Return a gray colormap with @var{n} entries corresponding to values from
+0 to @var{n}-1.  The argument @var{n} should be a scalar.  If it is
+omitted, 64 is assumed.
+@end deftypefn
+
+@deftypefn {Function File} {[@var{img}, @var{map}] =} gray2ind (@var{})
+Convert a gray scale intensity image to an Octave indexed image.
+@end deftypefn
+
+@deftypefn {Function File} {} image (@var{x}, @var{zoom})
+Display a matrix as a color image.  The elements of @var{x} are indices
+into the current colormap and should have values between 1 and the
+length of the colormap.  If @var{zoom} is omitted, a value of 4 is
+assumed. 
+@end deftypefn
+
+@deftypefn {Function File} {} imagesc (@var{x}, @var{zoom})
+Display a scaled version of the matrix @var{x} as a color image.  The
+matrix is scaled so that its entries are indices into the current
+colormap.  The scaled matrix is returned.  If @var{zoom} is omitted, a
+value of 4 is assumed.
+@end deftypefn
+
+@deftypefn {Function File} {} imshow (@var{x}, @var{map})
+@deftypefnx {Function File} {} imshow (@var{x}, @var{n})
+@deftypefnx {Function File} {} imshow (@var{i}, @var{n})
+@deftypefnx {Function File} {} imshow (@var{r}, @var{g}, @var{b})
+Display images.
+
+@code{imshow (@var{x})} displays an indexed image using the current
+colormap.
+
+@code{imshow (@var{x}, @var{map})} displays an indexed image using the
+specified colormap.
+
+@code{imshow (@var{i}, @var{n})} displays a gray scale intensity image.
+
+@code{imshow (@var{r}, @var{g}, @var{b})} displays an RGB image.
+@end deftypefn
+
+@deftypefn {Function File} {} ind2gray (@var{x}, @var{map})
+Convert an Octave indexed image to a gray scale intensity image.
+If @var{map} is omitted, the current colormap is used to determine the
+intensities.
+@end deftypefn
+
+@deftypefn {Function File} {[@var{r}, @var{g}, @var{b}] =} ind2rgb (@var{x}, @var{map})
+Convert an indexed image to red, green, and blue color components.
+If @var{map} is omitted, the current colormap is used for the conversion.
+@end deftypefn
+
+@deftypefn {Function File} {[@var{x}, @var{map}] =} loadimage (@var{file})
+Load an image file and it's associated color map from the specified
+@var{file}.  The image must be stored in Octave's image format.
+@end deftypefn
+
+@deftypefn {Function File} {} rgb2ntsc (@var{rgb})
+Image format conversion.
+@end deftypefn
+
+@deftypefn {Function File} {} ntsc2rgb (@var{yiq})
+Image format conversion.
+@end deftypefn
+
+@deftypefn {Function File} {} ocean (@var{n})
+Create color colormap.  The argument @var{n} should be a scalar.  If it
+is omitted, 64 is assumed.
+@end deftypefn
+
+@deftypefn {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{r}, @var{g}, @var{b})
+Convert and RGB image to an Octave indexed image.
+@end deftypefn
+
+@deftypefn {Function File} {} saveimage (@var{file}, @var{x}, @var{fmt}, @var{map})
+Save the matrix @var{x} to @var{file} in image format @var{fmt}.  Valid
+values for @var{fmt} are
+
+@table @code
+@item "img"
+Octave's image format.  The current colormap is also saved in the file.
+
+@item "ppm"
+Portable pixmap format.
+
+@item "ps"
+PostScript format.  Note that images saved in PostScript format can not
+be read back into Octave with loadimage.
+@end table
+
+If the fourth argument is supplied, the specified colormap will also be
+saved along with the image.
+
+Note: if the colormap contains only two entries and these entries are
+black and white, the bitmap ppm and PostScript formats are used.  If the
+image is a gray scale image (the entries within each row of the colormap
+are equal) the gray scale ppm and PostScript image formats are used,
+otherwise the full color formats are used.
+@end deftypefn
+
+@defvr {Built-in Variable} IMAGEPATH			
+A colon separated list of directories in which to search for image
+files.
+@end defvr