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# to_grayscale

torchvision.transforms.functional.to_grayscale(img, num_output_channels=1)

  Convert PIL image of any mode (RGB, HSV, LAB, etc) to grayscale version of image. This transform does not support torch Tensor.

  Parameters:

    - img (PIL Image) – PIL Image to be converted to grayscale.

    - num_output_channels (int) – number of channels of the output image. Value can be 1 or 3. Default is 1.

  Returns:

    Grayscale version of the image.

    - if num_output_channels = 1 : returned image is single channel

    - if num_output_channels = 3 : returned image is 3 channel with r = g = b

  Return type:

    PIL Image

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