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- # Copyright (C) 1995 John W. Eaton
- #
- # This file is part of Octave.
- #
- # Octave is free software; you can redistribute it and/or modify it
- # under the terms of the GNU General Public License as published by the
- # Free Software Foundation; either version 2, or (at your option) any
- # later version.
- #
- # Octave is distributed in the hope that it will be useful, but WITHOUT
- # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- # for more details.
- #
- # You should have received a copy of the GNU General Public License
- # along with Octave; see the file COPYING. If not, write to the Free
- # Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- function saveimage (filename, X, img_form, map)
-
- # Save a matrix to disk in image format.
- #
- # saveimage (filename, x) saves matrix x to file filename in octave's
- # image format. The current colormap is saved in the file also.
- #
- # saveimage (filename, x, "img") saves the image in the default format
- # and is the same as saveimage (filename, x).
- #
- # saveimage (filename, x, "ppm") saves the image in ppm format instead
- # of the default octave image format.
- #
- # saveimage (filename, x, "ps") saves the image in PostScript format
- # instead of the default octave image format. (Note: images saved in
- # PostScript format can not be read back into octave with loadimage.)
- #
- # saveimage (filename, x, format, map) saves the image along with the
- # specified colormap in the specified format.
- #
- # 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.
- #
- # SEE ALSO: loadimage, save, load, colormap
-
- # Written by Tony Richardson (amr@mpl.ucsd.edu) July 1994.
-
- if (nargin < 2 || nargin > 4)
- usage ("saveimage (filename, matrix, [format, [colormap]])");
- elseif (nargin == 2)
- if (! isstr (filename))
- error ("file name must be a string");
- endif
- map = colormap;
- img_form = "img";
- elseif (nargin == 3)
- if (! isstr (img_form))
- error ("image format specification must be a string");
- endif
- map = colormap;
- endif
-
- # XXX FIXME XXX -- we should check the remaining args.
-
- # XXX FIXME XXX -- we should use octave_tmp_file_name here.
-
- if (strcmp (img_form, "img") == 1)
- oct_file = filename;
- elseif (strcmp (img_form, "ppm") == 1)
- oct_file = sprintf ("image.%s.img", num2str (fix (rand * 10000)));
- ppm_file = filename;
- elseif (strcmp (img_form, "ps") == 1)
- oct_file = sprintf ("image.%s.img", num2str (fix (rand *10000)));
- ps_file = filename;
- endif
-
- # Save image in octave image file format
-
- eval (['save -asciii ', oct_file, ' map X']);
-
- # Convert to another format if requested.
-
- if (strcmp (img_form, "ppm") == 1)
- octtopnm = sprintf ("octtopnm %s > %s", oct_file, filename);
- rm = sprintf("rm -f %s", oct_file);
- shell_cmd (octtopnm);
- shell_cmd (rm);
- elseif (strcmp (img_form, "ps") == 1)
- octtopnm = sprintf ("octtopnm %s", oct_file);
- ppmtops = sprintf ("pnmtops > %s 2> /dev/null", filename);
- octtops = [ octtopnm, " | ", ppmtops ];
- rm = sprintf ("rm -f %s", oct_file);
- shell_cmd (octtops);
- shell_cmd (rm);
- endif
-
- endfunction
-