You know, stuff like this, which I had to write today, for turning a 2D floating point height map into a 2D greyscale image.

        let max = self
            .heights
            .elements_row_major_iter()
            .max_by(|a, b| a.total_cmp(b))
            .unwrap();
        let min = self
            .heights
            .elements_row_major_iter()
            .min_by(|a, b| a.total_cmp(b))
            .unwrap();
        //  Scale into 0..255
        let range = (max - min).max(0.001);
        let height_array = self
            .heights
            .as_rows()
            .into_iter()
            .map(|r| {
                r.into_iter()
                    .map(|v| ((((v - min) / range) / 256.0).round() as usize).clamp(0, 255) as u8)
                    .collect()
            })
            .collect();