--- /dev/null
+## Copyright (C) 2008-2012 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 3 of the License, 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, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} imwrite (@var{img}, @var{filename})
+## @deftypefnx {Function File} {} imwrite (@var{img}, @var{filename}, @var{fmt})
+## @deftypefnx {Function File} {} imwrite (@var{img}, @var{filename}, @var{fmt}, @var{p1}, @var{v1}, @dots{})
+## @deftypefnx {Function File} {} imwrite (@var{img}, @var{map}, @var{filename}, @dots{})
+## Write images in various file formats.
+##
+## If @var{fmt} is not supplied, the file extension of @var{filename} is used
+## to determine the format.
+##
+## The parameter-value pairs (@var{p1}, @var{v1}, @dots{}) are optional.
+## Currently the following options are supported for @t{JPEG} images:
+##
+## @table @samp
+## @item Quality
+## Set the quality of the compression. The value should be an
+## integer between 0 and 100, with larger values indicating higher visual
+## quality and lower compression.
+## @end table
+##
+## @strong{Supported Formats}
+## @multitable @columnfractions .33 .66
+## @headitem Extension @tab Format
+## @item bmp @tab Windows Bitmap
+## @item gif @tab Graphics Interchange Format
+## @item jpg and jpeg @tab Joint Photographic Experts Group
+## @item pbm @tab Portable Bitmap
+## @item pcx @tab
+## @item pgm @tab Portable Graymap
+## @item png @tab Portable Network Graphics
+## @item pnm @tab Portable Anymap
+## @item ppm @tab Portable Pixmap
+## @item ras @tab Sun Raster
+## @item tif and tiff @tab Tagged Image File Format
+## @item xwd @tab X11 Dump
+## @end multitable
+##
+## @strong{Unsupported Formats}
+## @multitable @columnfractions .33 .66
+## @headitem Extension @tab Format
+## @item hdf @tab Hierarchical Data Format V4
+## @item @nospell{jp2} and jpx @tab Joint Photographic Experts Group 2000
+## @end multitable
+##
+## @seealso{imread, imfinfo}
+## @end deftypefn
+
+function imwrite (img, varargin)
+
+ persistent imwrite_possible_formats = {
+ "bmp"; "gif"; "jp2"; "jpg"; "jpx"; "jpeg"; "hdf"; "pbm"; "pcx";
+ "pgm"; "png"; "pnm"; "ppm"; "ras"; "tif"; "tiff"; "xwd" };
+
+ persistent accepted_formats = __magick_format_list__ (imwrite_possible_formats);
+
+ if (nargin < 2 || ! (isnumeric (img) || islogical (img)))
+ print_usage ();
+ endif
+
+ map = [];
+ fmt = "";
+
+ offset = 1;
+ if (isnumeric (varargin{1}))
+ map = varargin{1};
+ if (isempty (map))
+ error ("imwrite: colormap must not be empty");
+ endif
+ offset = 2;
+ endif
+ if (offset <= length (varargin) && ischar (varargin{offset}))
+ filename = varargin{offset};
+ offset++;
+ if (rem (length (varargin) - offset, 2) == 0 && ischar (varargin{offset}))
+ fmt = varargin{offset};
+ offset++;
+ endif
+ else
+ print_usage ();
+ endif
+ if (offset < length (varargin))
+ has_param_list = 1;
+ for ii = offset:2:(length (varargin) - 1)
+ options.(varargin{ii}) = varargin{ii + 1};
+ endfor
+ else
+ has_param_list = 0;
+ endif
+
+ filename = tilde_expand (filename);
+
+ if (isempty (fmt))
+ [d, n, fmt] = fileparts (filename);
+ if (! isempty (fmt))
+ fmt = fmt(2:end);
+ endif
+ endif
+
+ if (isempty (img))
+ error ("imwrite: invalid empty image");
+ endif
+
+ if (issparse (img) || issparse (map))
+ error ("imwrite: sparse images not supported");
+ endif
+
+ if (! strcmp (fmt, accepted_formats))
+ error ("imwrite: %s: unsupported or invalid image format", fmt);
+ endif
+
+ img_class = class (img);
+ map_class = class (map);
+ nd = ndims (img);
+
+ if (isempty (map))
+ if (any (strcmp (img_class, {"logical", "uint8", "uint16", "double"})))
+ if ((nd == 2 || nd == 3) && strcmp (img_class, "double"))
+ img = uint8 (img * 255);
+ endif
+ ## FIXME -- should we handle color images w/ alpha channel here?
+ if (nd == 3 && size (img, 3) < 3)
+ error ("imwrite: invalid dimensions for truecolor image");
+ endif
+ if (nd > 5)
+ error ("imwrite: invalid %d-dimensional image data", nd);
+ endif
+ else
+ error ("imwrite: %s: invalid class for truecolor image", img_class);
+ endif
+ if (has_param_list)
+ __magick_write__ (filename, fmt, img, options);
+ else
+ __magick_write__ (filename, fmt, img);
+ endif
+ else
+ if (any (strcmp (img_class, {"uint8", "uint16", "double"})))
+ if (strcmp (img_class, "double"))
+ img = uint8 (img - 1);
+ endif
+ if (nd != 2 && nd != 4)
+ error ("imwrite: invalid size for indexed image");
+ endif
+ else
+ error ("imwrite: %s: invalid class for indexed image data", img_class);
+ endif
+ if (isa (map, "double"))
+ if (ndims (map) != 2 || size (map, 2) != 3)
+ error ("imwrite: invalid size for colormap");
+ endif
+ else
+ error ("imwrite: %s invalid class for indexed image colormap",
+ class (map));
+ endif
+
+ ## FIXME -- we should really be writing indexed images here but
+ ## __magick_write__ needs to be fixed to handle them.
+
+ [r, g, b] = ind2rgb (img, map);
+ tmp = uint8 (cat (3, r, g, b) * 255);
+
+ if (has_param_list)
+ __magick_write__ (filename, fmt, tmp, options);
+ ## __magick_write__ (filename, fmt, img, map, options);
+ else
+ __magick_write__ (filename, fmt, tmp);
+ ## __magick_write__ (filename, fmt, img, map);
+ endif
+ endif
+
+endfunction
+
+%% Test input validation
+%!error imwrite () # Wrong # of args
+%!error imwrite (1) # Wrong # of args
+%!error imwrite ({"cell"}, "filename.jpg") # Wrong class for img
+%!error imwrite (1, [], "filename.jpg") # Empty image map
+%!error imwrite (1, 2, 3) # No filename specified
+%!error imwrite (1, "filename") # No fmt specified
+%!error imwrite (1, "filename", "junk") # Invalid fmt specified
+%!error imwrite ([], "filename.jpg") # Empty img matrix
+%!error imwrite (spones(2), "filename.jpg") # Invalid sparse img
+
git://git.creatis.insa-lyon.fr / CreaPhase.git / blobdiff