annotate scripts/image/brighten.m @ 28789:28de41192f3c

Eliminate unneeded verification of nargin, nargout in m-files. * FIRfilter.m, FIRfilter_aggregation.m, get.m, polynomial.m, polynomial_superiorto.m, polynomial2.m, makeUniqueStrings.m, base64decode.m, base64encode.m, cd.m, lin2mu.m, record.m, sound.m, soundsc.m, accumarray.m, accumdim.m, bitcmp.m, bitset.m, cart2pol.m, celldisp.m, circshift.m, cplxpair.m, cumtrapz.m, flip.m, idivide.m, interpft.m, logspace.m, pol2cart.m, polyarea.m, postpad.m, prepad.m, rat.m, rot90.m, rotdim.m, shift.m, shiftdim.m, sortrows.m, trapz.m, dsearch.m, dsearchn.m, getappdata.m, getpixelposition.m, guidata.m, guihandles.m, isappdata.m, listfonts.m, uigetdir.m, waitforbuttonpress.m, __makeinfo__.m, doc.m, get_first_help_sentence.m, autumn.m, bone.m, brighten.m, cmpermute.m, cmunique.m, colorcube.m, contrast.m, cool.m, copper.m, cubehelix.m, flag.m, gray.m, gray2ind.m, hot.m, hsv.m, im2double.m, im2frame.m, imformats.m, jet.m, lines.m, ocean.m, pink.m, prism.m, rainbow.m, rgbplot.m, spinmap.m, spring.m, summer.m, viridis.m, white.m, winter.m, beep.m, importdata.m, is_valid_file_id.m, javachk.m, javaclasspath.m, findstr.m, genvarname.m, strmatch.m, bandwidth.m, commutation_matrix.m, cond.m, cross.m, isdefinite.m, ishermitian.m, issymmetric.m, krylov.m, linsolve.m, logm.m, lscov.m, null.m, ordeig.m, orth.m, rank.m, rref.m, vecnorm.m, bunzip2.m, citation.m, computer.m, copyfile.m, dir.m, dos.m, fileattrib.m, gunzip.m, inputParser.m, inputname.m, ismac.m, ispc.m, isunix.m, license.m, list_primes.m, methods.m, mkdir.m, movefile.m, nargchk.m, news.m, orderfields.m, recycle.m, tar.m, unix.m, unpack.m, untar.m, unzip.m, ver.m, version.m, what.m, zip.m, decic.m, fminbnd.m, fminunc.m, fsolve.m, fzero.m, glpk.m, humps.m, lsqnonneg.m, optimget.m, pqpnonneg.m, sqp.m, pathdef.m, camlookat.m, hidden.m, specular.m, plotmatrix.m, smooth3.m, sombrero.m, stemleaf.m, __gnuplot_drawnow__.m, __opengl_info__.m, ancestor.m, cla.m, close.m, closereq.m, copyobj.m, gca.m, gcf.m, ginput.m, graphics_toolkit.m, groot.m, hgload.m, hgsave.m, isgraphics.m, ishold.m, linkaxes.m, meshgrid.m, newplot.m, refresh.m, refreshdata.m, rotate.m, saveas.m, struct2hdl.m, conv.m, mkpp.m, mpoles.m, padecoef.m, pchip.m, polyder.m, polyfit.m, polygcd.m, polyint.m, polyout.m, polyval.m, ppder.m, ppint.m, getpref.m, ispref.m, rmpref.m, profexport.m, profshow.m, powerset.m, arch_fit.m, arma_rnd.m, blackman.m, detrend.m, diffpara.m, fftconv.m, fftfilt.m, filter2.m, freqz.m, freqz_plot.m, hamming.m, hanning.m, sinetone.m, sinewave.m, spectral_adf.m, spectral_xdf.m, stft.m, unwrap.m, gplot.m, ichol.m, ilu.m, spdiags.m, sprand.m, sprandn.m, spstats.m, svds.m, treelayout.m, treeplot.m, betainc.m, betaincinv.m, ellipke.m, gammainc.m, gammaincinv.m, legendre.m, pow2.m, hankel.m, pascal.m, rosser.m, toeplitz.m, bounds.m, corr.m, cov.m, histc.m, kendall.m, kurtosis.m, mad.m, mode.m, moment.m, prctile.m, quantile.m, range.m, ranks.m, run_count.m, skewness.m, spearman.m, std.m, var.m, zscore.m, dec2base.m, dec2bin.m, dec2hex.m, index.m, mat2str.m, native2unicode.m, ostrsplit.m, strjoin.m, strjust.m, strtok.m, substr.m, unicode2native.m, untabify.m, __debug_octave__.m, demo.m, example.m, fail.m, oruntests.m, dump_demos.m, speed.m, test.m, date.m, datenum.m, datestr.m, datevec.m, is_leap_year.m, now.m, weekday.m: Eliminate unneeded verification of nargin, nargout in m-files now that the interpreter checks these values.
author Rik <rik@octave.org>
date Thu, 24 Sep 2020 14:44:58 -0700
parents bd51beb6205e
children 7854d5752dd2
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 1999-2020 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{map_out} =} brighten (@var{beta})
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28 ## @deftypefnx {} {@var{map_out} =} brighten (@var{map}, @var{beta})
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29 ## @deftypefnx {} {@var{map_out} =} brighten (@var{h}, @var{beta})
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30 ## @deftypefnx {} {} brighten (@dots{})
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31 ## Brighten or darken a colormap.
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32 ##
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33 ## The argument @var{beta} must be a scalar between -1 and 1, where a negative
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34 ## value darkens and a positive value brightens the colormap.
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35 ##
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36 ## If the @var{map} argument is omitted, the function is applied to the current
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37 ## colormap.
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38 ##
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39 ## The first argument can also be a valid graphics handle @var{h}, in which
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40 ## case @code{brighten} is applied to the colormap associated with this handle.
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41 ##
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42 ## If no output is specified then the result is written to the current
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43 ## colormap.
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44 ## @seealso{colormap, contrast}
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45 ## @end deftypefn
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46
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47 function rmap = brighten (arg1, beta)
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48
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49 if (nargin < 1)
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50 print_usage ();
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51 endif
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52
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53 h = -1;
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54 if (nargin == 1)
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55 beta = arg1;
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56 m = colormap ();
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57 h = gcf ();
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58 else
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59 if (ishghandle (arg1))
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60 h = arg1;
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61 m = get (h, "colormap");
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62 elseif (iscolormap (arg1))
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63 m = arg1;
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64 else
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65 error ("brighten: first argument must be a colormap or a graphics handle");
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66 endif
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67 endif
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68
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69 if (! isscalar (beta) || beta <= -1 || beta >= 1)
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70 error ("brighten: BETA must be a scalar in the range (-1,1)");
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71 endif
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72
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73 if (beta > 0)
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74 gamma = 1 - beta;
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75 else
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76 gamma = 1 / (1 + beta);
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77 endif
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78
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79 if (nargout == 0)
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80 if (ishghandle (h))
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81 set (h, "colormap", m .^ gamma);
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82 else
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83 colormap (m .^ gamma);
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84 endif
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85 else
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86 rmap = m .^ gamma;
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87 endif
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88
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89 endfunction
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90
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91
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92 %!demo
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93 %! ## First figure uses default grayscale colormap
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94 %! clf;
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95 %! colormap (gray (64));
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96 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64));
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97 %! axis ([1, 64, 0, 1], "xy");
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98 %! set (gca, "xtick", []);
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99 %! title ("default grayscale colormap");
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100 %! pos = get (gcf, "position");
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101 %! pos(1) += pos(3) + 25;
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102 %! ## Second figure uses brightened grayscale colormap
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103 %! figure ("position", pos);
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104 %! colormap (gray (64));
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105 %! image (1:64, linspace (0, 1, 64), repmat ((1:64)', 1, 64));
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106 %! axis ([1, 64, 0, 1], "xy");
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107 %! set (gca, "xtick", []);
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108 %! brighten (0.5);
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109 %! title ("grayscale colormap brightened by 0.5");