From a65f1a8124bc3e2d93d9ef3510085bcb35a7113e Mon Sep 17 00:00:00 2001
From: Tycho Tatitscheff <tychot@bam.tech>
Date: Thu, 23 Nov 2023 18:31:26 +0100
Subject: [PATCH] wip: try upgrade polynomial approximation

---
 src/gamut/rgb/oklab.ts | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/src/gamut/rgb/oklab.ts b/src/gamut/rgb/oklab.ts
index 74aab90..2440005 100644
--- a/src/gamut/rgb/oklab.ts
+++ b/src/gamut/rgb/oklab.ts
@@ -117,31 +117,31 @@ export abstract class OkLabInterpolateGamutMapping extends OkLabGamutMapping {
 
     if (-1.8817030993265862 * a - 0.8093650129914288 * b > 1) {
       // Red component goes under zero first
-      k0 = +1.19086277;
-      k1 = +1.76576728;
-      k2 = +0.59662641;
-      k3 = +0.75515197;
-      k4 = +0.56771245;
+      k0 = +1.2334704415913271;
+      k1 = +1.761351995693893;
+      k2 = +0.5542481838071837;
+      k3 = +0.7556095399535735;
+      k4 = +0.5721039642854463;
       wl = +4.0767416360759592;
       wm = -3.3077115392580625;
       ws = +0.2309699031821046;
     } else if (1.8144407988011 * a - 1.1944526678052367 * b > 1) {
       // Green component goes under zero first
-      k0 = +0.73956515;
-      k1 = -0.45954404;
-      k2 = +0.08285427;
-      k3 = +0.1254107;
-      k4 = +0.14503204;
+      k0 = +0.7385344643416312;
+      k1 = -0.4602573851086104;
+      k2 = +0.0814153414715404;
+      k3 = +0.1299208728081628;
+      k4 = +0.1497697002866260;
       wl = -1.2684379732850315;
       wm = +2.6097573492876882;
       ws = -0.3413193760026572;
     } else {
       // Blue component goes under zero first
-      k0 = +1.35733652;
-      k1 = -0.00915799;
-      k2 = -1.1513021;
-      k3 = -0.50559606;
-      k4 = +0.00692167;
+      k0 = +1.3590679989582644;
+      k1 = -0.0046797266360291;
+      k2 = -1.1529380158175064;
+      k3 = -0.5071027666728768;
+      k4 = +0.0028881806843376;
       wl = -0.0041960761386755;
       wm = -0.7034186179359361;
       ws = +1.7076146940746113;