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### `tf.image.encode_png(image, compression=None, name=None)` {#encode_png}
PNG-encode an image.
`image` is a 3-D uint8 or uint16 Tensor of shape `[height, width, channels]`
where `channels` is:
* 1: for grayscale.
* 2: for grayscale + alpha.
* 3: for RGB.
* 4: for RGBA.
The ZLIB compression level, `compression`, can be -1 for the PNG-encoder
default or a value from 0 to 9. 9 is the highest compression level, generating
the smallest output, but is slower.
##### Args:
* <b>`image`</b>: A `Tensor`. Must be one of the following types: `uint8`, `uint16`.
3-D with shape `[height, width, channels]`.
* <b>`compression`</b>: An optional `int`. Defaults to `-1`. Compression level.
* <b>`name`</b>: A name for the operation (optional).
##### Returns:
A `Tensor` of type `string`. 0-D. PNG-encoded image.
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