altered_perception/color_spaces/
luma.rs

1use crate::Luma;
2use num_traits::cast::AsPrimitive;
3use rgb::RGB;
4
5impl<T> Luma<T> {
6    /// Converts an RGB pixel into a Luma pixel
7    ///
8    /// ```
9    /// use altered_perception::Luma;
10    /// use rgb::RGB;
11    ///
12    /// let rgb_pixel = RGB::new(1,2,3);
13    /// let luma_pixel: Luma<u8> = Luma::from_rgb::<u8>(rgb_pixel);
14    /// ```
15    pub fn from_rgb<N: std::convert::Into<f64>>(rgb_pixel: RGB<N>) -> Luma<T>
16    where
17        T: std::convert::Into<f64> + std::marker::Copy + 'static,
18        f64: AsPrimitive<T>,
19    {
20        Luma {
21            luminance: ((0.299 * (rgb_pixel.r.into()).powi(2)
22                + 0.587 * (rgb_pixel.g.into()).powi(2)
23                + 0.114 * (rgb_pixel.b.into()).powi(2))
24            .sqrt()
25            .round())
26            .as_(),
27        }
28    }
29
30    /// Creates a Luma pixel
31    pub fn new(luminance: T) -> Luma<T> {
32        Luma { luminance }
33    }
34
35    /// Converts a luma pixel into an RGB pixel
36    ///
37    /// ```
38    /// use altered_perception::Luma;
39    /// use rgb::RGB;
40    ///
41    /// let luma_pixel = Luma::new(155);
42    /// let rgb_pixel = Luma::to_rgb::<u8>(luma_pixel);
43    /// ```
44    pub fn to_rgb<N: std::convert::From<T>>(luma_pixel: Luma<T>) -> RGB<N>
45    where
46        T: Copy,
47    {
48        RGB {
49            r: luma_pixel.luminance.into(),
50            g: luma_pixel.luminance.into(),
51            b: luma_pixel.luminance.into(),
52        }
53    }
54}
altered_perception/color_spaces/luma.rs

altered_perception/color_spaces/
luma.rs
