More accurate ICtCp matrices (#365)

color-js · Nov 28, 2023 · 7ec8c42 · 7ec8c42
1 parent c7efc44
commit 7ec8c42
Showing 1 changed file with 9 additions and 9 deletions.
diff --git a/src/spaces/ictcp.js b/src/spaces/ictcp.js
@@ -13,9 +13,9 @@ const im2 = 32 / 2523;
 // The matrix below includes the 4% crosstalk components
 // and is from the Dolby "What is ICtCp" paper"
 const XYZtoLMS_M = [
-	[ 0.3592,  0.6976, -0.0358],
-	[-0.1922,  1.1004,  0.0755],
-	[ 0.0070,  0.0749,  0.8434]
+	[  0.3592832590121217,  0.6976051147779502, -0.0358915932320290 ],
+	[ -0.1920808463704993,  1.1004767970374321,  0.0753748658519118 ],
+	[  0.0070797844607479,  0.0748396662186362,  0.8433265453898765 ]
 ];
 // linear-light Rec.2020 to LMS, again with crosstalk
 // rational terms from Jan Fröhlich,
@@ -40,9 +40,9 @@ const LMStoIPT_M = [
 
 // inverted matrices, calculated from the above
 const IPTtoLMS_M = [
-	[0.99998889656284013833, 0.00860505014728705821,  0.1110343715986164786 ],
-	[1.0000111034371598616, -0.00860505014728705821, -0.1110343715986164786 ],
-	[1.000032063391005412,   0.56004913547279000113, -0.32063391005412026469],
+	[ 0.9999999999999998,  0.0086090370379328,  0.1110296250030260],
+	[ 0.9999999999999998, -0.0086090370379328, -0.1110296250030259],
+	[ 0.9999999999999998,  0.5600313357106791, -0.3206271749873188]
 ];
 /*
 const LMStoRec2020_M = [
@@ -52,9 +52,9 @@ const LMStoRec2020_M = [
 ];
 */
 const LMStoXYZ_M = [
-	[ 2.0701800566956135096,   -1.3264568761030210255,    0.20661600684785517081 ],
-	[ 0.36498825003265747974,   0.68046736285223514102,  -0.045421753075853231409],
-	[-0.049595542238932107896, -0.049421161186757487412,  1.1879959417328034394  ]
+	[  2.0701522183894223, -1.3263473389671563,  0.2066510476294053 ],
+	[  0.3647385209748072,  0.6805660249472273, -0.0453045459220347 ],
+	[ -0.0497472075358123, -0.0492609666966131,  1.1880659249923042 ]
 ];
 
 // Only the PQ form of ICtCp is implemented here. There is also an HLG form.