Function nannou::image::imageops::crop

pub fn crop<I>(
    image: &mut I, 
    x: u32, 
    y: u32, 
    width: u32, 
    height: u32
) -> SubImage<&mut I> where
    I: GenericImageView, 

Return a mutable view into an image The coordinates set the position of the top left corner of the crop.