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### `tf.image.random_contrast(image, lower, upper, seed=None)` {#random_contrast}
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:
* <b>`image`</b>: An image tensor with 3 or more dimensions.
* <b>`lower`</b>: float. Lower bound for the random contrast factor.
* <b>`upper`</b>: float. Upper bound for the random contrast factor.
* <b>`seed`</b>: A Python integer. Used to create a random seed. See
[`set_random_seed`](../../api_docs/python/constant_op.md#set_random_seed)
for behavior.
##### Returns:
The contrast-adjusted tensor.
##### Raises:
* <b>`ValueError`</b>: if `upper <= lower` or if `lower < 0`.
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