function love.load()
  local canvas = love.graphics.newCanvas(16, 16)
  -- love.graphics.setCanvas(canvas)
  --       love.graphics.clear()
  --       love.graphics.setBlendMode("alpha")
  --       love.graphics.setColor(1, 0, 0, 0.8)
  --       love.graphics.rectangle('fill', 0, 0, 100, 100)
  -- love.graphics.setCanvas()
	local img = love.graphics.newImage('ghost.png')
  psystem = love.graphics.newParticleSystem(img, 32)
  psystem:setParticleLifetime(1, 5) -- Particles live at least 2s and at most 5s.
  psystem:setEmissionRate(5)
  psystem:setSizeVariation(0.7)
  psystem:setLinearAcceleration(-40, -40, 40, 40) -- Random movement in all directions.
  psystem:setColors(1, 1, 1, 0.5, 1, 1, 1, 0) -- Fade to transparency.
end

function love.draw()
  -- Draw the particle system at the center of the game window.
  love.graphics.draw(psystem, love.graphics.getWidth() * 0.5, love.graphics.getHeight() * 0.5)
end

local frame = 0
function love.update(dt)
  psystem:update(dt)
  frame = frame + 1
  s = love.graphics.captureScreenshot(string.format( "%012d.png", frame ) )
end