anchor: love.math.colorToBytes
  Converts a color from 0..1 to 0..255 range.
  rb, gb, bb, ab = love.math.colorToBytes( r, g, b, a )
  r number Red color component.
  g number Green color component.
  b number Blue color component.
  a (nil) number Alpha color component.
  rb number Red color component in 0..255 range.
  gb number Green color component in 0..255 range.
  bb number Blue color component in 0..255 range.
  ab number Alpha color component in 0..255 range or nil if alpha is not specified.