pub fn pixel_diffs<I, J, F, P>( actual: &I, expected: &J, is_diff: F, ) -> Vec<Diff<I::Pixel>>where P: Pixel, I: GenericImage<Pixel = P>, J: GenericImage<Pixel = P>, F: Fn((u32, u32, I::Pixel), (u32, u32, J::Pixel)) -> bool,
Lists pixels that differ between left and right images.