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/picture/XBitColourXpaceFromPalette.lua

@@ -0,0 +1,12 @@
+-- Copyright 2010 Paulo Silva
+-- 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=getpicturesize();
+ok,bitd=inputbox("colourspace from palette","bitdepth:",4,1,8,5);
+if ok==true then
+  bitd3=(2^bitd);bitd8=(2^(math.floor(bitd/2)));bitd9=(2^((math.floor((bitd-1)/2))+1))
+  for y1=0,(bitd8-1),1 do 
+    for x1=0,(bitd9-1),1 do 
+      for y2=0,(bitd3-1),1 do 
+        for x2=0,(bitd3-1),1 do 
+          putpicturepixel(x1*bitd3+x2,y1*bitd3+y2,matchcolor((y2*255)/(bitd3-1),((y1*8+x1)*255)/(bitd3-1),(x2*255)/(bitd3-1))) 
+          end;end;end;end;end