(image, lower, upper, seed=None)
return adjust_contrast(image, contrast_factor)
Adjust the contrast of an image by a random factor.

  Equivalent to `adjust_contrast()` but uses a `contrast_factor` randomly
  picked in the interval `[lower, upper]`.

  Args:
    image: An image tensor with 3 or more dimensions.
    lower: float.  Lower bound for the random contrast factor.
    upper: float.  Upper bound for the random contrast factor.
    seed: A Python integer. Used to create a random seed. See
      @{tf.set_random_seed}
      for behavior.

  Returns:
    The contrast-adjusted tensor.

  Raises:
    ValueError: if `upper <= lower` or if `lower < 0`.
Adjust the contrast of an image by a random factor.
Adjust the contrast of an image by a random factor .
def random_contrast(image, lower, upper, seed=None):
  """Adjust the contrast of an image by a random factor.

  Equivalent to `adjust_contrast()` but uses a `contrast_factor` randomly
  picked in the interval `[lower, upper]`.

  Args:
    image: An image tensor with 3 or more dimensions.
    lower: float.  Lower bound for the random contrast factor.
    upper: float.  Upper bound for the random contrast factor.
    seed: A Python integer. Used to create a random seed. See
      @{tf.set_random_seed}
      for behavior.

  Returns:
    The contrast-adjusted tensor.

  Raises:
    ValueError: if `upper <= lower` or if `lower < 0`.
  """
  if upper <= lower:
    raise ValueError('upper must be > lower.')

  if lower < 0:
    raise ValueError('lower must be non-negative.')

  # Generate an a float in [lower, upper]
  contrast_factor = random_ops.random_uniform([], lower, upper, seed=seed)
  return adjust_contrast(image, contrast_factor)
def random_contrast ( image , lower , upper , seed = None ) : if upper <= lower : raise ValueError ( 'upper must be > lower.' ) if lower < 0 : raise ValueError ( 'lower must be non-negative.' ) # Generate an a float in [lower, upper] contrast_factor = random_ops . random_uniform ( [ ] , lower , upper , seed = seed ) return adjust_contrast ( image , contrast_factor )