Mercurial > hg > octave-nkf
annotate scripts/image/hsv2rgb.m @ 14552:86854d032a37
maint: miscellaneous style fixes for .m files
* audio/mu2lin.m, deprecated/cut.m, general/cplxpair.m,
general/genvarname.m, geometry/rectint.m, help/gen_doc_cache.m,
image/hsv2rgb.m, image/rainbow.m, io/textscan.m,
miscellaneous/bzip2.m, miscellaneous/compare_versions.m,
miscellaneous/fact.m, miscellaneous/menu.m, optimization/fminbnd.m,
optimization/fminunc.m, optimization/fzero.m, optimization/sqp.m,
plot/__gnuplot_drawnow__.m, plot/axis.m, plot/findobj.m,
plot/legend.m, plot/peaks.m, plot/private/__errplot__.m,
plot/private/__fltk_print__.m, plot/private/__go_draw_axes__.m,
plot/private/__patch__.m, polynomial/pchip.m, polynomial/residue.m,
signal/periodogram.m, sparse/sprandsym.m, statistics/base/moment.m,
statistics/distributions/expcdf.m, statistics/distributions/expinv.m,
statistics/distributions/exppdf.m, statistics/tests/prop_test_2.m,
statistics/tests/sign_test.m, statistics/tests/t_test.m,
statistics/tests/t_test_2.m, statistics/tests/t_test_regression.m,
strings/regexptranslate.m, time/datetick.m:
Style fixes.
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Wed, 11 Apr 2012 22:07:00 -0400 |
| parents | 1f911333ed3d |
| children | 806ea52af230 |
| rev | line source |
|---|---|
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maint: update copyright notices for 2012
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1 ## Copyright (C) 1999-2012 Kai Habel |
| 3803 | 2 ## |
| 3 ## This file is part of Octave. | |
| 4 ## | |
| 5 ## Octave is free software; you can redistribute it and/or modify it | |
| 6 ## under the terms of the GNU General Public License as published by | |
| 7016 | 7 ## the Free Software Foundation; either version 3 of the License, or (at |
| 8 ## your option) any later version. | |
| 3803 | 9 ## |
| 10 ## Octave is distributed in the hope that it will be useful, but | |
| 11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 ## General Public License for more details. | |
| 14 ## | |
| 15 ## You should have received a copy of the GNU General Public License | |
| 7016 | 16 ## along with Octave; see the file COPYING. If not, see |
| 17 ## <http://www.gnu.org/licenses/>. | |
| 3803 | 18 |
| 19 ## -*- texinfo -*- | |
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20 ## @deftypefn {Function File} {@var{rgb_map} =} hsv2rgb (@var{hsv_map}) |
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21 ## @deftypefnx {Function File} {@var{rgb_img} =} hsv2rgb (@var{hsv_img}) |
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22 ## Transform a colormap or image from hue-saturation-value (HSV) space to |
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23 ## red-green-blue (RGB) space. |
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24 ## @seealso{rgb2hsv, ind2rgb, ntsc2rgb} |
| 3803 | 25 ## @end deftypefn |
| 26 | |
| 27 ## Author: Kai Habel <kai.habel@gmx.de> | |
| 28 ## Adapted-by: jwe | |
| 29 | |
| 30 function rgb_map = hsv2rgb (hsv_map) | |
| 31 | |
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32 ## Each color value x = (r,g,b) is calculated with |
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33 ## x = (1-sat)*val+sat*val*f_x(hue) |
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34 ## where f_x(hue) is a piecewise defined function for |
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35 ## each color with f_r(hue-2/3) = f_g(hue) = f_b(hue-1/3). |
| 3803 | 36 |
| 37 if (nargin != 1) | |
| 6046 | 38 print_usage (); |
| 3803 | 39 endif |
| 40 | |
| 7375 | 41 ## If we have an image convert it into a color map. |
| 42 if (ismatrix (hsv_map) && ndims (hsv_map) == 3) | |
| 43 is_image = true; | |
| 44 Sz = size (hsv_map); | |
| 45 hsv_map = [hsv_map(:,:,1)(:), hsv_map(:,:,2)(:), hsv_map(:,:,3)(:)]; | |
| 46 ## Convert to a double image. | |
| 47 if (isinteger (hsv_map)) | |
| 48 C = class (hsv_map); | |
| 49 low = double (intmin (C)); | |
| 50 high = double (intmax (C)); | |
| 51 hsv_map = (double (hsv_map) - low) / (high - low); | |
| 52 endif | |
| 53 else | |
| 54 is_image = false; | |
| 55 endif | |
| 56 | |
| 4030 | 57 if (! ismatrix (hsv_map) || columns (hsv_map) != 3) |
| 3803 | 58 error ("hsv2rgb: argument must be a matrix of size nx3"); |
| 59 endif | |
| 60 | |
| 61 ## set values <0 to 0 and >1 to 1 | |
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diff
changeset
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62 hsv_map = (hsv_map >= 0 & hsv_map <= 1) .* hsv_map ... |
| 3803 | 63 + (hsv_map < 0) .* 0 + (hsv_map > 1); |
| 64 | |
| 65 ## fill rgb map with v*(1-s) | |
| 66 rgb_map = kron ([1, 1, 1], hsv_map(:,3) .* (1 - hsv_map(:,2))); | |
| 67 | |
| 68 ## red(hue-2/3)=green(hue)=blue(hue-1/3) | |
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69 ## apply modulo 1 for red and blue |
| 3803 | 70 t = hsv_map(:,1); |
| 71 tp = t'; | |
| 72 hue = [(tp - 2/3 - floor (t - 2/3)'); | |
| 73 tp; | |
| 74 (tp - 1/3 - floor (t - 1/3)')]'; | |
| 75 | |
| 76 ## factor s*v -> f | |
| 77 f = kron ([1, 1, 1], hsv_map(:,2)) .* kron ([1, 1, 1], hsv_map(:,3)); | |
| 78 | |
| 79 ## add s*v* hue-function to rgb map | |
| 80 rgb_map = rgb_map + f .* (6 * (hue < 1/6) .* hue | |
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81 + (hue >= 1/6 & hue < 1/2) |
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82 + (hue >= 1/2 & hue < 2/3) .* (4 - 6 * hue)); |
| 3803 | 83 |
| 7375 | 84 ## If input was an image, convert it back into one. |
| 85 if (is_image) | |
| 86 rgb_map = reshape (rgb_map, Sz); | |
| 87 endif | |
| 88 | |
| 3803 | 89 endfunction |