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Remove default colormap for ind2rgb and ind2gray.
author Carnë Draug <carandraug+dev@gmail.com>
date Sun, 02 Dec 2012 13:12:53 +0100
parents a1b634240352
children b1cd65881592
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15689
14b7679891dd ind2sub ind2gray: merge common code in private function, expanding fix for images when integers, input check, and expansion of colormap to ind2gray.
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1 ## Copyright (C) 1994-2012 John W. Eaton
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2 ## Copyright (C) 2012 Carnë Draug
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3 ##
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4 ## This file is part of Octave.
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5 ##
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6 ## Octave is free software; you can redistribute it and/or modify it
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7 ## under the terms of the GNU General Public License as published by
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8 ## the Free Software Foundation; either version 3 of the License, or (at
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9 ## your option) any later version.
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10 ##
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11 ## Octave is distributed in the hope that it will be useful, but
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12 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 ## General Public License for more details.
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15 ##
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16 ## You should have received a copy of the GNU General Public License
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17 ## along with Octave; see the file COPYING. If not, see
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18 ## <http://www.gnu.org/licenses/>.
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19
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20 ## private function for the ind2something functions which have a lot of code
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21 ## in common
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22
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23 function [x, map] = ind2x (name, x, map)
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24
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25 ## Check if X is an indexed image.
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a1b634240352 maint: merge default into image-overhaul head, specially changeset 806ea52. Resolving many conflicts and fixing bugs related to correctly indexing on image class (float vs integer have different offset)
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26 if (ndims (x) != 2 || issparse (x) || (isfloat (x) && ! isindex (x)) ||
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27 ! ismember (class (x), {"double", "single", "uint8", "uint16"}))
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28 error ("%s: X must be an indexed image", name);
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29 endif
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30
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31 ## Check the color map.
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32 if (! iscolormap (map))
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33 error ("%s: MAP must be a valid colormap", name);
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34 endif
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35
14b7679891dd ind2sub ind2gray: merge common code in private function, expanding fix for images when integers, input check, and expansion of colormap to ind2gray.
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36 ## Do we have enough colors in the color map?
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37 ## there's an offset of 1 when the indexed image is an integer class so we fix
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38 ## it now and convert it to float only if really necessary and even then only
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39 ## to single precision since its enough for both uint8 and uint16
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40 maxidx = max (x(:));
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41 if (isinteger (x))
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42 if (maxidx == intmax (class (x)))
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43 x = single (x);
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44 endif
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45 x += 1;
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46 maxidx += 1;
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47 endif
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48
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49 rm = rows (map);
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50 if (rm < maxidx)
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51 ## Pad with the last color in the map for matlab compatibility
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52 pad = repmat (map(end,:), maxidx-rm, 1);
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53 map(end+1:maxidx, :) = pad;
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54 endif
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55
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56 endfunction