kolibrios/data/common/media/grafx2/scripts/samples_2.4/brush/GrayscaleAvg.lua

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--BRUSH Remap: Grayscale (average)
--by Richard Fhager
--http://hem.fyristorg.com/dawnbringer/
-- Copyright 2010 Richard Fhager
--
-- 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; version 2
-- of the License. See <http://www.gnu.org/licenses/>
w, h = getbrushsize()
for x = 0, w - 1, 1 do
for y = 0, h - 1, 1 do
r, g, b = getcolor(getbrushpixel(x,y))
a = (r+g+b)/3
putbrushpixel(x, y, matchcolor(a,a,a));
end
end