[css-color-4] Update chromatic adaptation matrices to higher precision

w3c · Nov 22, 2023 · 9c4db75 · 9c4db75
1 parent 4bd3561
commit 9c4db75
Showing 1 changed file with 8 additions and 7 deletions.
diff --git a/css-color-4/conversions.js b/css-color-4/conversions.js
@@ -305,11 +305,12 @@ function D65_to_D50(XYZ) {
 	// - convert from XYZ to retinal cone domain
 	// - scale components from one reference white to another
 	// - convert back to XYZ
-	// http://www.brucelindbloom.com/index.html?Eqn_ChromAdapt.html
+	// see https://github.com/LeaVerou/color.js/pull/354/files
+
 	var M =  [
-		[  1.0479298208405488,    0.022946793341019088,  -0.05019222954313557 ],
-		[  0.029627815688159344,  0.990434484573249,     -0.01707382502938514 ],
-		[ -0.009243058152591178,  0.015055144896577895,   0.7518742899580008  ]
+		[  1.0479297925449969,    0.022946870601609652,  -0.05019226628920524  ],
+		[  0.02962780877005599,   0.9904344267538799,    -0.017073799063418826 ],
+		[ -0.009243040646204504,  0.015055191490298152,   0.7518742814281371   ]
 	];
 
 	return multiplyMatrices(M, XYZ);
@@ -318,9 +319,9 @@ function D65_to_D50(XYZ) {
 function D50_to_D65(XYZ) {
 	// Bradford chromatic adaptation from D50 to D65
 	var M = [
-		[  0.9554734527042182,   -0.023098536874261423,  0.0632593086610217   ],
-		[ -0.028369706963208136,  1.0099954580058226,    0.021041398966943008 ],
-		[  0.012314001688319899, -0.020507696433477912,  1.3303659366080753   ]
+		[  0.947386632323667,     0.28196156725620036,  -0.1708280666484637   ],
+		[ -0.7357288996314816,    1.6804471734451398,    0.035992069603406264 ],
+		[  0.029218329379919382, -0.05145129980782719,   0.7733468362356041   ]
 	];
 
 	return multiplyMatrices(M, XYZ);