Lua: added 'matchcolor2' that uses DawnBringer's perceptual formula. Updated scripts numbering to 2.4

git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1797 416bcca6-2ee7-4201-b75f-2eb2f807beb1

share/grafx2/scripts/samples_2.4/palette/InvertedRGB.lua

@@ -0,0 +1,27 @@
+--PALETTE Modify: Inverted RGB 
+--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/>
+
+-- This script was adopted from Evalion, a Javascript codecrafting/imageprocessing project
+-- http://goto.glocalnet.net/richard_fhager/evalion/evalion.html 
+
+
+
+for c = 0, 255, 1 do
+
+  r,g,b = getcolor(c)
+  
+  r2 = (g+b)/2
+  g2 = (r+b)/2
+  b2 = (r+g)/2
+
+  setcolor(c, r2,g2,b2)
+
+end