Mercurial > octave
view scripts/image/private/colorspace_conversion_input_check.m @ 32632:2e484f9f1f18 stable
maint: update Octave Project Developers copyright for the new year
author | John W. Eaton <jwe@octave.org> |
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date | Fri, 22 Dec 2023 12:08:17 -0500 |
parents | 597f3ee61a48 |
children |
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######################################################################## ## ## Copyright (C) 2016-2024 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## This file is part of Octave. ## ## Octave is free software: you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation, either version 3 of the License, or ## (at your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ## GNU General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## Private function the functions that convert between color spaces, i.e., ## rgb2ntsc, rgb2hsv, hsv2rgb, and ntsc2rgb. All of these functions need to ## handle input in the same way. The returned flags are meant to be handled ## by the complementary private function colorspace_conversion_revert() function [in_arg, sz, is_im, is_nd] ... = colorspace_conversion_input_check (fcn, arg_name, in_arg) cls = class (in_arg); sz = size (in_arg); ## If we have an image convert it into a color map. if (! iscolormap (in_arg)) if (! any (strcmp (cls, {"uint8", "int8", "int16", "uint16", ... "single", "double"}))) error ("%s: %s of invalid data type '%s'", fcn, arg_name, cls); elseif (size (in_arg, 3) != 3) error ("%s: %s must be a colormap or %s image", fcn, arg_name, arg_name); elseif (! isreal (in_arg) || ! isnumeric (in_arg)) error ("%s: %s must be numeric and real", fcn, arg_name); endif is_im = true; ## For floating point values, R, G and B should be in the [0 1] range, ## otherwise they don't make any sense. We accept those values ## anyways because we must return something for Matlab compatibility. ## User case is when a function returns an RGB image just slightly outside ## the range due to floating point rounding errors. ## Allow for ND images, i.e., multiple images on the 4th dimension. nd = ndims (in_arg); if (nd == 3) is_nd = false; elseif (nd == 4) is_nd = true; in_arg = permute (in_arg, [1 2 4 3]); elseif (nd > 4) error ("%s: invalid %s with more than 4 dimensions", fcn, arg_name); endif in_arg = reshape (in_arg, [numel(in_arg)/3 3]); else is_im = false; is_nd = false; endif ## Convert to floating point (remember to leave class single alone) if (isinteger (in_arg)) int_max = double (intmax (cls)); int_min = double (intmin (cls)); if (int_min < 0) in_arg = (double (in_arg) - int_min) / (int_max - int_min); else in_arg = double (in_arg) / int_max; endif endif endfunction