/usr/share/octave/packages/image-2.6.1/private/colorspace_conversion_revert.m is in octave-image 2.6.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 | ## Copyright (C) 2015 Carnë Draug <carandraug+dev@gmail.com>
##
## This program 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.
##
## This program 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 this program; if not, see
## <http:##www.gnu.org/licenses/>.
## Private function for functions that convert between color spaces, i.e.,
## rgb2xyz, xyz2rgb, xyz2lab, lab2xyz, rgb2lab and lab2rgb. This reverts
## a colormap type into the same shape and class as it was in the input.
## (But setting the keep_class flag to 1 tells this function to not change
## the class back.) The other flags are meant to come from complementary
## private function colorspace_conversion_input_check()
##
## adapted by: Hartmut Gimpel, 2015
function rv = colorspace_conversion_revert (rv, cls, sz, is_im, is_nd, is_int, keep_class)
if (is_im)
if (is_nd)
rv = reshape (rv, [sz(1:2) sz(4) sz(3)]);
rv = permute (rv, [1 2 4 3]);
else
rv = reshape (rv, sz);
endif
endif
if (is_int && ~keep_class)
rv *= intmax (cls);
endif
endfunction
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