# tf.io.decode_jpeg

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| [![](https://www.tensorflow.org/images/tf_logo_32px.png) TensorFlow 1 version](https://www.tensorflow.org/versions/r1.15/api_docs/python/tf/io/decode_jpeg) |

Decode a JPEG-encoded image to a uint8 tensor.

#### View aliases


**Main aliases**

[`tf.image.decode_jpeg`](https://www.tensorflow.org/api_docs/python/tf/io/decode_jpeg)
**Compat aliases for migration**

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

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

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    tf.io.decode_jpeg(
        contents, channels=0, ratio=1, fancy_upscaling=True,
        try_recover_truncated=False, acceptable_fraction=1, dct_method='', name=None
    )

The attr `channels` indicates the desired number of color channels for the
decoded image.

#### Accepted values are:

- 0: Use the number of channels in the JPEG-encoded image.
- 1: output a grayscale image.
- 3: output an RGB image.

If needed, the JPEG-encoded image is transformed to match the requested number
of color channels.

The attr `ratio` allows downscaling the image by an integer factor during
decoding. Allowed values are: 1, 2, 4, and 8. This is much faster than
downscaling the image later.

This op also supports decoding PNGs and non-animated GIFs since the interface is
the same, though it is cleaner to use [`tf.image.decode_image`](https://www.tensorflow.org/versions/r2.0/api_docs/python/tf/io/decode_image).

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| ## Args ||
|---|---|
| `contents` | A `Tensor` of type `string`. 0-D. The JPEG-encoded image. |
| `channels` | An optional `int`. Defaults to `0`. Number of color channels for the decoded image. |
| `ratio` | An optional `int`. Defaults to `1`. Downscaling ratio. |
| `fancy_upscaling` | An optional `bool`. Defaults to `True`. If true use a slower but nicer upscaling of the chroma planes (yuv420/422 only). |
| `try_recover_truncated` | An optional `bool`. Defaults to `False`. If true try to recover an image from truncated input. |
| `acceptable_fraction` | An optional `float`. Defaults to `1`. The minimum required fraction of lines before a truncated input is accepted. |
| `dct_method` | An optional `string`. Defaults to `""`. string specifying a hint about the algorithm used for decompression. Defaults to "" which maps to a system-specific default. Currently valid values are \["INTEGER_FAST", "INTEGER_ACCURATE"\]. The hint may be ignored (e.g., the internal jpeg library changes to a version that does not have that specific option.) |
| `name` | A name for the operation (optional). |

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| ## Returns ||
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| A `Tensor` of type `uint8`. ||

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