w = 256
h = 256
p = {}
bright = {0.33, 0.9, 0.12}
dark = {0.33, 0.5, 0.12}
current_color = bright
rev_color = 0

for y = 0, h-1 do
  if y % 32 == 0 then
    rev_color = 1
  end
  if y % 64 == 0 then
    rev_color = 0
  end
  for x = 0, w-1 do
    if x % 32 == 0 then
      if rev_color == 0 then
        current_color = dark
      end
      if rev_color == 1 then
        current_color = bright
      end
    end
    if x % 64 == 0 then
      if rev_color == 0 then
        current_color = bright
      end
      if rev_color == 1 then
        current_color = dark
      end
    end
    p[y*w+x+1] = current_color
  end
end

A copy of #115, eltopo's original chess board.

I'm testing the shorter variable names for size coding:

-w instead of "width"
-h instead of "height"
-p instead of "pixels"
-Also, one of w or h can be omitted if all pixels are present.

btw: Each element in the pixel array can be

-an array of three floats (R, G, B, each ranging from 0.0 to 1.0), or:
-a single int value in the format 0xRRGGBB.

==

btw, the size coding competition is on!! http://codegolf.stackexchange.com/questions/18322/lua-render-a-chess-board-in-smallest-code