70 lines
1.3 KiB
Lua
70 lines
1.3 KiB
Lua
--SCENE: Remap pic 2 RGB, 1lineED-dith. (Same line simple error-diffusion dither)
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--by Richard Fhager
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--http://hem.fyristorg.com/dawnbringer/
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-- Copyright 2010 Richard Fhager
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--
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-- This program is free software; you can redistribute it and/or
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-- modify it under the terms of the GNU General Public License
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-- as published by the Free Software Foundation; version 2
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-- of the License. See <http://www.gnu.org/licenses/>
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power = 0.615
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c1 = 0.8 -- Error weight (white is green)
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c2 = 0.2 -- RGB weight (white is r+g+b)
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-- Set Palette (to a predefined one)
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colors = {{ 0, 0, 0},
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{255, 0, 0},
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{ 0,255, 0},
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{ 0, 0,255}
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}
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chm = {1,0,0}
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for c = 1, #colors, 1 do
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setcolor(c-1,colors[c][1],colors[c][2],colors[c][3])
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end
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for c = #colors, 255, 1 do
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setcolor(c,0,0,0)
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end
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w, h = getpicturesize()
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for y = 0, h - 1, 1 do
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re = 0
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ge = 0
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be = 0
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for x = (y%2), w - 1, 1 do
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r,g,b = getbackupcolor(getbackuppixel(x,y));
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rn = re * c1 + r * chm[1+(y+0+x)%3] * c2
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gn = ge * c1 + g * chm[1+(y+1+x)%3] * c2
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bn = be * c1 + b * chm[1+(y+2+x)%3] * c2
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n = matchcolor(rn,gn,bn);
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putpicturepixel(x, y, n);
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rn,gn,bn = getcolor(getpicturepixel(x,y));
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re = (re + (r - rn)) * power
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ge = (ge + (g - gn)) * power
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be = (be + (b - bn)) * power
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end
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end
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