mindspore.dataset.vision.py_transforms.Grayscale

class mindspore.dataset.vision.py_transforms.Grayscale(num_output_channels=1)[source]

Convert the input PIL Image to grayscale.

Parameters

num_output_channels (int) – Number of channels of the output grayscale image, which can be 1 or 3 (default=1). If num_output_channels is 3, the returned image will have 3 identical RGB channels.

Raises

TypeError – If num_output_channels is not of type integer.
ValueError – If num_output_channels is not 1 or 3.

Supported Platforms:: CPU

Examples

>>> from mindspore.dataset.transforms.py_transforms import Compose
>>> transforms_list = Compose([py_vision.Decode(),
...                            py_vision.Grayscale(3),
...                            py_vision.ToTensor()])
>>> # apply the transform to dataset through map function
>>> image_folder_dataset = image_folder_dataset.map(operations=transforms_list,
...                                                 input_columns="image")