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# Grayscale

class torchvision.transforms.Grayscale(num_output_channels=1)

  Convert image to grayscale. If the image is torch Tensor, it is expected to have […, 3, H, W] shape, where … means an arbitrary number of leading dimensions

  Parameters:

    num_output_channels (int) – (1 or 3) number of channels desired for output image

  Returns:

    Grayscale version of the input.

    - 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

  forward(img)
    Parameters:

      img (PIL Image or Tensor) – Image to be converted to grayscale.

    Returns:

      Grayscaled image.

    Return type:

      PIL Image or Tensor

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