81 lines
1.3 KiB
Lua
81 lines
1.3 KiB
Lua
--SCENE: Remap pic to 3bit, LineEDdith. (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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--
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-- Just a demonstration.
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--
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power = 0.6
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-- Channel shades (shades = 2 ^ bit-depth)
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shades = 2
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mult = 255 / (shades-1)
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colors = {}
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col = 0
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for r = 0, shades-1, 1 do
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for g = 0, shades-1, 1 do
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for b = 0, shades-1, 1 do
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col = col + 1
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colors[col] = { r*mult, g*mult, b*mult }
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end
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end
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end
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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 + r
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gn = ge + g
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bn = be + b
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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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