get("#348") -- rgb functions

function makeIcon(img)
  local x, y, w, h = 0, 0, img.width, img.height -- full image
  
  lines = {}
  for yy=y, y+h-1 do
    local line = {}
    for xx=x, x+w-1 do
      pix = img.getInt(xx, yy)
      b = math.floor(bright(rgb(pix))*25+0.5)
      table.insert(line, string.char(string.byte("A")+b))
    end
    table.insert(lines, table.concat(line))
  end
  return table.concat(lines, ".")
end

Began life as a copy of #382