PNG-encode an image.
tf.raw_ops.EncodePng(
    image, compression=-1, name=None
)
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 | |
|---|---|
| image | A Tensor. Must be one of the following types:uint8,uint16.
3-D with shape[height, width, channels]. | 
| compression | An optional int. Defaults to-1. Compression level. | 
| name | A name for the operation (optional). | 
| Returns | |
|---|---|
| A Tensorof typestring. |