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January 21, 2021 09:45
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OkLab in Rust
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//! https://bottosson.github.io/posts/oklab/ | |
/// oklab from linear rgb (0-1 ranges) | |
pub fn lab_from_rgb([r, g, b]: [f32; 3]) -> (f32, f32, f32) { | |
let x = 0.4121656120 * r + 0.5362752080 * g + 0.0514575653 * b; | |
let y = 0.2118591070 * r + 0.6807189584 * g + 0.1074065790 * b; | |
let z = 0.0883097947 * r + 0.2818474174 * g + 0.6302613616 * b; | |
let x = x.cbrt(); | |
let y = y.cbrt(); | |
let z = z.cbrt(); | |
( | |
0.2104542553 * x + 0.7936177850 * y - 0.0040720468 * z, | |
1.9779984951 * x - 2.4285922050 * y + 0.4505937099 * z, | |
0.0259040371 * x + 0.7827717662 * y - 0.8086757660 * z, | |
) | |
} | |
/// linear rgb from oklab (0-1 ranges) | |
pub fn rgb_from_lab((l, a, b): (f32, f32, f32)) -> [f32; 3] { | |
let x = l + 0.3963377774 * a + 0.2158037573 * b; | |
let y = l - 0.1055613458 * a - 0.0638541728 * b; | |
let z = l - 0.0894841775 * a - 1.2914855480 * b; | |
let x = x.powi(3); | |
let y = y.powi(3); | |
let z = z.powi(3); | |
[ | |
4.0767245293 * x - 3.3072168827 * y + 0.2307590544 * z, | |
-1.2681437731 * x + 2.6093323231 * y - 0.3411344290 * z, | |
-0.0041119885 * x - 0.7034763098 * y + 1.7068625689 * z, | |
] | |
} | |
/// 0-1 normalized lch from oklab. | |
pub fn lch_from_lab((l, a, b): (f32, f32, f32)) -> (f32, f32, f32) { | |
use std::f32::consts::TAU; | |
let c = a.hypot(b); | |
let h = (b.atan2(a) + TAU) % TAU / TAU; | |
(l, c, h) | |
} | |
/// Oklab from 0-1 normalized lch. | |
pub fn lab_from_lch((l, c, h): (f32, f32, f32)) -> (f32, f32, f32) { | |
use std::f32::consts::TAU; | |
let (sin_h, cos_h) = (h * TAU).sin_cos(); | |
let a = c * cos_h; | |
let b = c * sin_h; | |
(l, a, b) | |
} | |
/// 0-1 normalized lch from linear rgb | |
pub fn lch_from_rgb(rgb: [f32; 3]) -> (f32, f32, f32) { | |
lch_from_lab(lab_from_rgb(rgb)) | |
} | |
/// linear rgb from 0-1 normalized lch | |
pub fn rgb_from_lch(lch: (f32, f32, f32)) -> [f32; 3] { | |
rgb_from_lab(lab_from_lch(lch)) | |
} |
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