Fix LUV normalization

Cargo.toml

@@ -2,7 +2,7 @@ workspace = { members = ["./src/app"] }
 
 [package]
 name = "histogram_equalization"
-version = "0.1.1"
+version = "0.1.2"
 edition = "2021"
 description = "Histogram equalization"
 readme = "README.md"

src/app/src/main.rs

@@ -2,7 +2,7 @@ use colorutils_rs::rgb_to_rgba;
 use image::GenericImageView;
 use image::io::Reader as ImageReader;
 
-use histogram_equalization::{clahe_hsl_rgba, clahe_lab_rgb, clahe_lab_rgba, ClaheGridSize, hist_equal_luv_rgb};
+use histogram_equalization::{clahe_hsl_rgba, clahe_lab_rgb, clahe_lab_rgba, clahe_luv_rgba, ClaheGridSize, hist_equal_luv_rgb};
 
 fn main() {
     let img = ImageReader::open("assets/asset_2.jpg")
@@ -29,7 +29,7 @@ fn main() {
     let stride = dimensions.0 as usize * channels;
     let mut dst_bytes: Vec<u8> = vec![0; stride * dimensions.1 as usize];
 
-    clahe_lab_rgba(
+    clahe_luv_rgba(
         src_bytes,
         stride as u32,
         &mut dst_bytes,

src/luv.rs

@@ -40,8 +40,9 @@ pub(crate) fn generic_image_to_luv<const IMAGE: u8>(
             let luv = rgb.to_luv();
             unsafe {
                 *new_slice.get_unchecked_mut(h_px) = (luv.l * full_scale).round().min(scale) as u16;
-                *new_slice.get_unchecked_mut(h_px + 1) = luv.u as u16;
-                *new_slice.get_unchecked_mut(h_px + 2) = luv.v as u16;
+                // Just for storing in u16 adding 500 to subtract 500 after to keep values in positive range
+                *new_slice.get_unchecked_mut(h_px + 1) = (luv.u + 500f32) as u16;
+                *new_slice.get_unchecked_mut(h_px + 2) = (luv.v + 500f32) as u16;
                 if image_configuration.has_alpha() {
                     let a = *src.get_unchecked(
                         src_offset + px + image_configuration.get_a_channel_offset(),
@@ -81,11 +82,10 @@ pub(crate) fn luv_to_generic_image<const IMAGE: u8>(
 
             let l = unsafe { *source_slice.get_unchecked(px) } as f32 * full_scale;
 
-            let rgb = Luv::new(
-                l,
-                unsafe { *source_slice.get_unchecked(px + 1) } as f32,
-                unsafe { *source_slice.get_unchecked(px + 2) } as f32,
-            );
+            let u = unsafe { *source_slice.get_unchecked(px + 1) } as f32 - 500f32;
+            let v = unsafe { *source_slice.get_unchecked(px + 2) } as f32 - 500f32;
+
+            let rgb = Luv::new(l, u, v);
             let rgb = rgb.to_rgb();
             unsafe {
                 *dst.get_unchecked_mut(