def blend(arr1, arr2, alpha=0.5):
    """Blend 2 arrays together, mixing with alpha.

	Parameters
	----------
	arr1:array
		Image 1.
	arr2:array
		Image 2.
	alpha:float
		Higher alpha makes image more like image 1.

	Returns
	-------
	array
		Resulting image.

	"""
    return alpha * arr1 + (1.0 - alpha) * arr2
