Add hsv bw algorithm

src/lib.rs

@@ -1,11 +1,12 @@
 use image::RgbaImage;
-use palette::{Hsl, IntoColor, Lab, LinSrgb, Oklab, Srgb};
+use palette::{Hsl, Hsv, IntoColor, Lab, LinSrgb, Oklab, Srgb};
 
 #[derive(Clone, Copy, PartialEq, Eq)]
 pub enum BwMethod {
     SrgbAverage,
     LinSrgbAverage,
     Hsl,
+    Hsv,
     Cielab,
     Oklab,
 }
@@ -27,6 +28,11 @@ impl BwMethod {
                 pixel.saturation = 0.0;
                 pixel.into_color()
             }
+            Self::Hsv => {
+                let mut pixel: Hsv = pixel.into_color();
+                pixel.saturation = 0.0;
+                pixel.into_color()
+            }
             Self::Cielab => {
                 let mut pixel: Lab = pixel.into_color();
                 pixel.a = 0.5;

src/main.rs

@@ -11,6 +11,7 @@ enum BwMethod {
     SrgbAverage,
     LinSrgbAverage,
     Hsl,
+    Hsv,
     Cielab,
     Oklab,
 }
@@ -21,6 +22,7 @@ impl From<BwMethod> for mark::BwMethod {
             BwMethod::SrgbAverage => mark::BwMethod::SrgbAverage,
             BwMethod::LinSrgbAverage => mark::BwMethod::LinSrgbAverage,
             BwMethod::Hsl => mark::BwMethod::Hsl,
+            BwMethod::Hsv => mark::BwMethod::Hsv,
             BwMethod::Cielab => mark::BwMethod::Cielab,
             BwMethod::Oklab => mark::BwMethod::Oklab,
         }