Function plot_interface::dependency::image::imageops::colorops::grayscale_with_type_alpha

pub fn grayscale_with_type_alpha<NewPixel, I>(
    image: &I
) -> ImageBuffer<NewPixel, Vec<<NewPixel as Pixel>::Subpixel, Global>> where
    I: GenericImageView,
    NewPixel: Pixel + FromColor<LumaA<<<I as GenericImageView>::Pixel as Pixel>::Subpixel>>, 

Convert the supplied image to a grayscale image with the specified pixel type. Alpha channel is preserved.