# tf.image.random_contrast

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| [![](https://www.tensorflow.org/images/GitHub-Mark-32px.png) View source on GitHub](https://github.com/tensorflow/tensorflow/blob/v2.14.0/tensorflow/python/ops/image_ops_impl.py#L2098-L2141) |

Adjust the contrast of an image or images by a random factor.

#### View aliases


**Compat aliases for migration**

See
[Migration guide](https://www.tensorflow.org/guide/migrate) for
more details.

[`tf.compat.v1.image.random_contrast`](https://www.tensorflow.org/api_docs/python/tf/image/random_contrast)

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    tf.image.random_contrast(
        image, lower, upper, seed=None
    )

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

For producing deterministic results given a `seed` value, use
[`tf.image.stateless_random_contrast`](https://www.tensorflow.org/versions/r2.14/api_docs/python/tf/image/stateless_random_contrast). Unlike using the `seed` param
with `tf.image.random_*` ops, `tf.image.stateless_random_*` ops guarantee the
same results given the same seed independent of how many times the function is
called, and independent of global seed settings (e.g. tf.random.set_seed).

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| ## Args ||
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| `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.compat.v1.set_random_seed`](https://www.tensorflow.org/versions/r2.14/api_docs/python/tf/compat/v1/set_random_seed) for behavior. |

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#### Usage Example:

    x = [[[1.0, 2.0, 3.0],
          [4.0, 5.0, 6.0]],
        [[7.0, 8.0, 9.0],
          [10.0, 11.0, 12.0]]]
    tf.image.random_contrast(x, 0.2, 0.5)
    <tf.Tensor: shape=(2, 2, 3), dtype=float32, numpy=...>

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| ## Returns ||
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| The contrast-adjusted image(s). ||

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| ## Raises ||
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| `ValueError` | if `upper <= lower` or if `lower < 0`. |

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