function mutate(low, high){
  var item = Math.floor(Math.random()*(high - low) + low)
  return item
}

function getLowestMutationColors(colorFraction){
  var newColorFraction = Math.floor(colorFraction - 255*mutation)
  if(newColorFraction < 0){
    newColorFraction = 0
  }
  return newColorFraction
}

function getHighestMutationColors(colorFraction){
  var newColorFraction = Math.floor(colorFraction + 255*mutation)
  if(newColorFraction > 255){
    newColorFraction = 255
  }
  return newColorFraction
}