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maint: update Octave Project Developers copyright for the new year
author John W. Eaton <jwe@octave.org>
date Fri, 22 Dec 2023 12:08:17 -0500
parents 597f3ee61a48
children
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 1994-2024 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {@var{rgb} =} ind2rgb (@var{x}, @var{map})
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28 ## @deftypefnx {} {[@var{R}, @var{G}, @var{B}] =} ind2rgb (@var{x}, @var{map})
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29 ## Convert an indexed image to red, green, and blue color components.
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30 ##
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31 ## The image @var{x} must be an indexed image which will be converted using the
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32 ## colormap @var{map}. If @var{map} does not contain enough colors for the
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33 ## image, pixels in @var{x} outside the range are mapped to the last color in
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34 ## the map.
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35 ##
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36 ## The output may be a single RGB image (@nospell{MxNx3} matrix where M and N
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37 ## are the original image @var{x} dimensions, one for each of the red, green
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38 ## and blue channels). Alternatively, the individual red, green, and blue
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39 ## color matrices of size @nospell{MxN} may be returned.
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40 ##
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41 ## Multi-dimensional indexed images (of size @nospell{MxNx1xK}) are also
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42 ## supported.
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43 ##
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44 ## @seealso{rgb2ind, ind2gray, hsv2rgb}
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45 ## @end deftypefn
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46
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47 function [R, G, B] = ind2rgb (x, map)
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48
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49 if (nargin != 2)
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50 print_usage ();
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51 endif
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52 [x, map] = ind2x ("ind2rgb", x, map);
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53
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54 ## Compute result
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55 sz = size (x);
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56 R = reshape (map(x(:), 1), sz);
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57 G = reshape (map(x(:), 2), sz);
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58 B = reshape (map(x(:), 3), sz);
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59
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60 ## Use ND array if only one output is requested.
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61 if (nargout <= 1)
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62 if (ndims (x) == 2)
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63 R = reshape ([R(:); G(:); B(:)], [sz, 3]);
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64 elseif (ndims (x) == 4)
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65 R = permute (reshape ([R(:); G(:); B(:)], [sz(1) sz(2) sz(4) 3]), ...
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66 [1 2 4 3]);
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67 else
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68 ## we should never reach here since ind2x() should filter them out
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69 error ("ind2rgb: an indexed image must have 2 or 4 dimensions");
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70 endif
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71 endif
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72
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73 endfunction
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74
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75
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76 %!shared img, map, ergb, rgb, r, g, b
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77 %! img = [2 4 5; 3 2 5; 1 2 4];
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78 %! map = [0.0 0.0 0.0
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79 %! 0.2 0.4 0.6
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80 %! 0.4 0.4 0.5
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81 %! 0.3 0.7 1.0
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82 %! 0.1 0.5 0.8];
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83 %! ergb(:,:,1) = [0.2 0.3 0.1; 0.4 0.2 0.1; 0.0 0.2 0.3];
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84 %! ergb(:,:,2) = [0.4 0.7 0.5; 0.4 0.4 0.5; 0.0 0.4 0.7];
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85 %! ergb(:,:,3) = [0.6 1.0 0.8; 0.5 0.6 0.8; 0.0 0.6 1.0];
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86 %! ## test basic usage with 1 and 3 outputs
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87 %! [rgb] = ind2rgb (img, map);
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88 %! [r, g, b] = ind2rgb (img, map);
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89 %!
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90 %!assert (ergb, rgb)
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91 %!assert (ergb, reshape ([r(:) g(:) b(:)], [size(img) 3]))
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92 %!test
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93 %! ## test correction for integers
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94 %! img = uint8 (img - 1);
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95 %! [rgb] = ind2rgb (img, map);
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96 %! assert (ergb, rgb);
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97 %!test
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98 %! ## Check that values below lower bound are mapped to first color value
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99 %! warning ("off", "Octave:ind2rgb:invalid-idx-img", "local");
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100 %! rgb = ind2rgb ([-1 0 2], gray (64));
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101 %! assert (rgb(:,1:2,:), zeros (1,2,3));
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102 %! assert (rgb(:,3,:), 1/63 * ones (1,1,3));
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103
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104 ## Test input validation
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105 %!error <Invalid call> ind2rgb ()
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106 %!error <Invalid call> ind2rgb (1)
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107 %!error <X must be an indexed image> ind2rgb (ones (3,3,3), jet (64))
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108 %!error <X must be an indexed image> ind2rgb (1+i, jet (64))
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109 %!error <X must be an indexed image> ind2rgb (sparse (1), jet (64))
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110 %!error <X must be an indexed image> ind2rgb (1.1, jet (64))
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111 %!error <X must be an indexed image> ind2rgb ({1}, jet (64))
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112 %!error <MAP must be a valid colormap> ind2rgb (1, {1})
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113 %!error <MAP must be a valid colormap> ind2rgb (1, 1+i)
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114 %!error <MAP must be a valid colormap> ind2rgb (1, ones (2,2,2))
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115 %!error <MAP must be a valid colormap> ind2rgb (1, ones (2,4))
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116 %!error <MAP must be a valid colormap> ind2rgb (1, [-1])
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117 %!error <MAP must be a valid colormap> ind2rgb (1, [2])
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118
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119 %!warning <contains colors outside of colormap> ind2rgb ([-1 1], jet (64));
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120 %!warning <contains colors outside of colormap> ind2rgb ([0 1 2], gray (5));
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121 %!warning <contains colors outside of colormap> ind2rgb ([1 2 6], gray (5));
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122 %!warning <contains colors outside of colormap> ind2rgb (uint8 ([1 2 5]), gray (5));
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123
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124 ## We support any unsigned integer type which Matlab does not. See
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125 ## bug #47115.
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126 %!test
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127 %! cmap = repmat (linspace (0, 1, 9)(:), [1 3]);
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128 %! ind = [0 3 6; 1 4 7; 2 5 8];
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129 %! rgb = repmat (reshape (linspace (0, 1, 9), [3 3]), [1 1 3]);
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9e43deb9bfc3 maint: Use semicolon after assert statement inside %!test blocks.
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130 %! assert (ind2rgb (uint8 (ind), cmap), rgb);
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131 %! assert (ind2rgb (uint16 (ind), cmap), rgb);
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132 %! assert (ind2rgb (uint32 (ind), cmap), rgb);
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133 %! assert (ind2rgb (uint64 (ind), cmap), rgb);
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134 %! fail ("ind2rgb (int8 (ind), cmap)", "X must be an indexed image")
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135 %! fail ("ind2rgb (int16 (ind), cmap)", "X must be an indexed image")
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136 %! fail ("ind2rgb (int32 (ind), cmap)", "X must be an indexed image")
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137 %! fail ("ind2rgb (int64 (ind), cmap)", "X must be an indexed image")
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138 %!
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139 %! cmap(65541,:) = cmap(9,:); # index outside the uint16 range
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140 %! cmap(9,:) = 0;
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141 %! ind(3,3) = 65540;
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142 %! assert (ind2rgb (uint32 (ind), cmap), rgb);
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143 %! assert (ind2rgb (uint64 (ind), cmap), rgb);
28885
25b7ffb514f3 ind2x.m: Fix for integer saturation (bug #59242).
Markus Mützel <markus.muetzel@gmx.de>
parents: 27985
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144
25b7ffb514f3 ind2x.m: Fix for integer saturation (bug #59242).
Markus Mützel <markus.muetzel@gmx.de>
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145 %!test <*59242>
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146 %! warning ("off", "Octave:ind2rgb:invalid-idx-img", "local");
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147 %! assert (ind2rgb (uint64 (intmax ("uint64")), jet (64)), ...
25b7ffb514f3 ind2x.m: Fix for integer saturation (bug #59242).
Markus Mützel <markus.muetzel@gmx.de>
parents: 27985
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148 %! reshape ([0.5,0,0], [1,1,3]));