-- a jittering filter implemented in lua

amount = 18  -- spread amount

edge_duplicate=1
local x,y
var2=var1
for y = 0, height-1 do
    for x = 0, width-1 do
      local nx,ny
      local r,g,b,a
      nx=x+(math.random()-0.5)*amount
      ny=y+(math.random()-0.5)*amount
      r,g,b,a=get_rgba(nx,ny)
      set_rgba(x,y, r,g,b,a)
    end
    progress(y/height)
end