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>,
Expand description

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