[07d29c]: rgb2gray.m  Maximize  Restore  History

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## Copyright (C) 2000, 2001 Kai Habel
##
## 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 2 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, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
## -*- texinfo -*-
## @deftypefn {Function File} @var{I}= rgb2gray (@var{M})
## converts a color map to a gray map.
## The RGB map is converted into the YIQ space of ntsc. The luminance
## value (Y) is taken to create a gray color map.
## R = G = B = Y
## @end deftypefn
## Author: Kai Habel <kai.habel@gmx.de>
## Date: 19. March 2000
function graymap = rgb2gray (rgb)
if (nargin != 1)
usage ("graymap = rgb2gray (map)");
endif
msg = "rgb2gray: argument must be a matrix of size n x 3";
if (! is_matrix (rgb))
error (msg);
endif
nc = columns (rgb);
if (nc != 3)
error (msg);
endif
ntscmap = rgb2ntsc (rgb);
graymap = ntscmap (:, 1) * ones (1, 3);
endfunction

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