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

Used in the notebooks

Used in the tutorials

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. 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).

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 for behavior.

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=...>

The contrast-adjusted image(s).

ValueError if upper <= lower or if lower < 0.