Function imageproc::utils::describe_pixel_diffs

pub fn describe_pixel_diffs<I, J, P>(
    actual: &I, 
    expected: &J, 
    diffs: &[Diff<P>]
) -> String where
    P: Pixel,
    P::Subpixel: Debug,
    I: GenericImage<Pixel = P>,
    J: GenericImage<Pixel = P>, 

Gives a summary description of a list of pixel diffs for use in error messages.