def img_to_vgg(x):
    """Condition an image for use with the VGG16 model."""
    x = x[:, :, ::-1]
    x[:, :, (0)] -= 103.939
    x[:, :, (1)] -= 116.779
    x[:, :, (2)] -= 123.68
    x = x.transpose((2, 0, 1))
    return x
