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annotate scripts/image/rgb2ind.m @ 16630:5d6243c2acbf

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rgb2ind.m: Enable handling of ND images, and enable n,tol,map,dither as inputs. * rgb2ind.m: Enable handling of ND images, and enable n,tol,map,dither as inputs.
author Adam H Aitkenhead <adamhaitkenhead@gmail.com>
date Sat, 04 May 2013 10:53:43 +0100
parents 6ae93518356c
children c979e6db619b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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72c96de7a403 maint: update copyright notices for 2012
John W. Eaton <jwe@octave.org>
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1 ## Copyright (C) 1994-2012 John W. Eaton
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89c8d8f8f87b rgb2ind: find unique RGB values for indexed image and scale colormap for correct range
Carnë Draug <carandraug+dev@gmail.com>
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2 ## Copyright (C) 2012 Carnë Draug
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3 ## Copyright (C) 2013 Adam H Aitkenhead
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4 ##
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5 ## This file is part of Octave.
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6 ##
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7 ## Octave is free software; you can redistribute it and/or modify it
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8 ## under the terms of the GNU General Public License as published by
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9 ## the Free Software Foundation; either version 3 of the License, or (at
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
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10 ## your option) any later version.
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11 ##
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12 ## Octave is distributed in the hope that it will be useful, but
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
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13 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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14 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
5ca126254d15 [project @ 1996-07-11 21:25:22 by jwe]
jwe
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15 ## General Public License for more details.
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jwe
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16 ##
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17 ## You should have received a copy of the GNU General Public License
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18 ## along with Octave; see the file COPYING. If not, see
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19 ## <http://www.gnu.org/licenses/>.
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20
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21 ## -*- texinfo -*-
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22 ## @deftypefn {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{rgb})
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23 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{rgb}, @var{map})
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24 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{rgb}, @var{n})
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25 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{rgb}, @var{tol})
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26 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{rgb}, @var{map}, @var{dither_option})
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27 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{rgb}, @var{n}, @var{dither_option})
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28 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{rgb}, @var{tol}, @var{dither_option})
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29 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{R}, @var{G}, @var{B})
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30 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{R}, @var{G}, @var{B}, @var{map})
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31 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{R}, @var{G}, @var{B}, @var{n})
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32 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{R}, @var{G}, @var{B}, @var{tol})
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33 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{R}, @var{G}, @var{B}, @var{map}, @var{dither_option})
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34 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{R}, @var{G}, @var{B}, @var{n}, @var{dither_option})
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35 ## @deftypefnx {Function File} {[@var{x}, @var{map}] =} rgb2ind (@var{R}, @var{G}, @var{B}, @var{tol}, @var{dither_option})
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36 ## Convert an image in red-green-blue (RGB) color space to an indexed image.
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Adam H Aitkenhead <adamhaitkenhead@gmail.com>
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37 ##
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Adam H Aitkenhead <adamhaitkenhead@gmail.com>
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38 ## The input image @var{rgb} must be an N-dimensional RGB image (MxNxO...x3 array) where M,N,O... are the
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Adam H Aitkenhead <adamhaitkenhead@gmail.com>
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39 ## image dimensions, and the final dimension contains the values in the red, green and blue
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Adam H Aitkenhead <adamhaitkenhead@gmail.com>
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40 ## channels. Alternatively, the red, green and blue color channels can be input as separate arrays @var{R}, @var{G} and @var{B}.
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41 ##
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42 ## @var{map} defines the colormap to be used. Alternatively, @var{n} or @var{tol} may be used to define
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43 ## the maximum number of colors to use in an automatically generated colormap. @var{n} is related to @var{tol}
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44 ## by: @var{n} = (floor (1/@var{tol}) + 1)^3;
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45 ## @var{tol} must be >0 and <=1.
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46 ##
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47 ## @var{dither_option} is a string which enables or disables dithering: 'dither' (default) or 'nodither'.
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48 ##
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49 ## @seealso{ind2rgb, rgb2hsv, rgb2ntsc}
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50 ## @end deftypefn
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51
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52 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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53 ## Created: July 1994
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54 ## Adapted-By: jwe
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55
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56 function [x, map] = rgb2ind (varargin)
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57
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58 ## Gather the inputs
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59 if (nargin < 1 || nargin > 6)
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60 print_usage ();
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61 else
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62
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63 ## Test for dither_option, by checking if the final input is a string
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64 if ischar (varargin{end})
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65 dither_option = varargin{end};
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66 dither_check = true;
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67 else
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68 dither_option = 'dither';
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69 dither_check = false;
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70 endif
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71
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72 ## Read the rgb input
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73 if (nargin-dither_check==1 || nargin-dither_check==2)
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74
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75 rgb = varargin{1};
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76 if (size (rgb)(end) != 3)
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77 error ("rgb2ind: The input image must be an RGB image (MxNxO...x3 array).");
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78 elseif (min (rgb(:)) < 0 || max (rgb(:)) > 1)
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79 error ("rgb2ind: The input image must contain values between 0 and 1.");
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80 endif
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81 if (nargin-dither_check==2)
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82 option = varargin{2};
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83 else
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84 dither_option = 'nodither';
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85 endif
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86
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87 ## Read the R,G,B inputs
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88 elseif (nargin-dither_check==3 || nargin-dither_check==4)
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89
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90 R = varargin{1};
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91 G = varargin{2};
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92 B = varargin{3};
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93 if (! size_equal (R, G, B))
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94 error ("rgb2ind: R, G, and B must have the same size");
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95 endif
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96 if (nargin-dither_check==4)
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97 option = varargin{4};
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98 else
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99 dither_option = 'nodither';
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100 endif
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101
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102 rgb = reshape ([R(:), G(:), B(:)], [size(R), 3]);
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103
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104 endif
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105 endif
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106
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107 ## Apply a limited colormap if required
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108 if (exist ('option','var'))
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109
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110 if (size (option,1)==1)
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111
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112 if option>0 && option<=1
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113 ## option: tol
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114 tol = option;
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115 n = (floor (1/option) + 1)^3;
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116 else
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117 ## option: n
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118 n = option;
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119 endif
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120 optionstr = sprintf ('-colors %d',n);
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121
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122 else
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123
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124 ## option: map
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125 map = option;
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126 if (isequal (map(:,1),map(:,2)) || isequal (map(:,1),map(:,3)) || isequal (map(:,2),map(:,3)))
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127 error ('rgb2ind: The colormap cannot contain matching R,G, or B channels.')
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128 endif
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129 fnmap = tmpnam;
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130 map = reshape (map, size (map, 1), 1, 3);
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131 imwrite (map, fnmap, 'tiff');
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132 optionstr = sprintf ('-map %s', fnmap);
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133
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134 endif
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135
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136 ## Prepare the Graphicsmagick dithering option
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137 if strcmp (dither_option, 'nodither')
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138 ditherstr = '+dither';
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139 elseif strcmp (dither_option, 'dither')
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140 ditherstr = '-dither';
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141 endif
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142
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143 ## Perform the image processing using Graphicsmagick
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144 fna = tmpnam;
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145 fnb = tmpnam;
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146 imwrite (rgb, fna, 'tiff');
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147 gmstr = sprintf ('gm convert %s %s %s %s', fna, ditherstr, optionstr, fnb);
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148 system (gmstr);
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149 rgb = imread (fnb);
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150
5922
1748af819fbb [project @ 2006-08-14 18:16:57 by jwe]
jwe
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151 endif
11587
c792872f8942 all script files: untabify and strip trailing whitespace
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152
16630
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153 ## Conversion of rgb image to x,map
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154 sz = size (rgb);
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155 pr = prod (sz(1:end-1));
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156 x = zeros (sz(1:end-1));
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157 [map,~,x(:)] = unique (reshape(rgb, [pr, 3]), "rows");
559
4e826edfbc56 [project @ 1994-07-25 22:18:28 by jwe]
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158
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159 ## a colormap is of class double and values between 0 and 1
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160 switch (class (rgb))
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161 case {"single", "double", "logical"}
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162 ## do nothing, return the same
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163 case {"uint8", "uint16"}
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164 map = double (map) / double (intmax (class (rgb)));
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165 case "int16"
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166 map = (double (im) + 32768) / 65535;
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167 otherwise
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168 error ("unsupported image class %s", im_class);
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169 endswitch
559
4e826edfbc56 [project @ 1994-07-25 22:18:28 by jwe]
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170
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171 ## we convert to the smallest class necessary to encode the image. Matlab
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172 ## documentation does not mention what it does when uint16 is not enough...
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173 ## When an indexed image is of integer class, there's a -1 offset to the
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174 ## colormap, hence the adjustment
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175 if (rows (map) < 256)
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176 x = uint8 (x - 1);
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177 elseif (rows (map) < 65536)
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178 x = uint16 (x - 1);
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179 else
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180 ## leave it as double
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181 endif
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182
559
4e826edfbc56 [project @ 1994-07-25 22:18:28 by jwe]
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183 endfunction
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184
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185
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186 %% FIXME: Need some functional tests or %!demo blocks
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187
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188 %% Test input validation
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189 %!error rgb2ind ()
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190 %!error rgb2ind (1,2)
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191 %!error rgb2ind (1,2,3,4)
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192