/usr/share/octave/packages/image-2.2.2/private/handle_colorspec.m is in octave-image 2.2.2-1.
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 39 40 41 42 | ## Copyright (C) 2013 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/>.
## There's 3 ways to specify colors:
## RGB triplet values
## short names
## long names
##
## And probably more undocumented ways to do it.
function rgb = handle_colorspec (func, spec)
if (iscolormap (spec))
rgb = spec;
elseif (ischar (spec))
switch (tolower (spec))
case {"b", "blue" }, rgb = [0 0 1];
case {"c", "cyan" }, rgb = [0 1 1];
case {"g", "green" }, rgb = [0 1 0];
case {"k", "black" }, rgb = [0 0 0];
case {"m", "magenta"}, rgb = [1 0 1];
case {"r", "red" }, rgb = [1 0 0];
case {"w", "white" }, rgb = [1 1 1];
case {"y", "yellow" }, rgb = [1 1 0];
otherwise
error("%s: unknown color '%s'", func, spec);
endswitch
else
error ("%s: invalid color specification");
endif
endfunction
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