roywei commented on issue #10775: RGB to gray ops URL: https://github.com/apache/incubator-mxnet/issues/10775#issuecomment-386170200 @pribadihcr , no we currently rely on open cv's implementation, you could follow tf.image.rgb_to_grayscale's [implementation](https://github.com/tensorflow/tensorflow/blob/r1.8/tensorflow/python/ops/image_ops_impl.py#L1278) to do something similar on NDArrays. Refer to [expand_dim](https://mxnet.incubator.apache.org/api/python/ndarray/ndarray.html#mxnet.ndarray.NDArray.expand_dims), and maybe convert to numpy array and use [tensordot](https://docs.scipy.org/doc/numpy-1.14.0/reference/generated/numpy.tensordot.html) if necessary. (not sure if mx.nd.dot is same as tensordot with axis =[-1, -1]) @sandeep-krishnamurthy could you help label feature request, NDArray? Thanks
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