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修正Cam16Jch到sRGB的转换算法。

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徐涛
2025-02-08 13:34:55 +08:00
parent 5d3fc2903b
commit e2806a0cc5
1 changed files with 17 additions and 11 deletions
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28
color-module/src/convert/mod.rs
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@@ -2,23 +2,29 @@ use palette::{
cam16::{Cam16Jch, Parameters},
convert::FromColorUnclamped,
luma::Luma,
Hsl, IntoColor, IsWithinBounds, Oklab, Oklch, Srgb,
Hsl, IntoColor, IsWithinBounds, Lchuv, Oklab, Oklch, Srgb,
};
pub fn map_cam16jch_to_srgb(origin: &Cam16Jch<f32>) -> Srgb {
let mut new_original = Cam16Jch::new(origin.lightness, origin.chroma, origin.hue);
const FACTOR: f32 = 0.99;
let original_xyz = origin.into_xyz(Parameters::default_static_wp(40.0));
let mut new_srgb = Srgb::from_color_unclamped(original_xyz);
if new_srgb.is_within_bounds() {
return new_srgb;
}
let lchuv: Lchuv = Lchuv::from_color_unclamped(original_xyz);
let mut c: f32 = lchuv.chroma;
let original_c = c;
let h = lchuv.hue;
let l = lchuv.l;
loop {
let new_srgb =
Srgb::from_color_unclamped(new_original.into_xyz(Parameters::default_static_wp(40.0)));
if new_srgb.is_within_bounds() {
let new_lchuv = Lchuv::new(l, c, h);
new_srgb = new_lchuv.into_color();
c -= original_c / 1000.0;
if c > 0.0 && (new_srgb.is_within_bounds()) {
break new_srgb;
}
new_original = Cam16Jch::new(
new_original.lightness,
new_original.chroma * FACTOR,
new_original.hue,
);
}
}