From: Marius Gavrilescu <marius@ieval.ro>
Date: Wed, 17 Jun 2015 13:06:27 +0000 (+0300)
Subject: Replace precomputed LUV constants with compile-time expressions
X-Git-Tag: 0.002~6
X-Git-Url: http://git.ieval.ro/?a=commitdiff_plain;h=af9d49f1d8e98ba73e8dca0287c7a73cab1c2eb1;p=convert-color-hsluv.git

Replace precomputed LUV constants with compile-time expressions
---

diff --git a/lib/Convert/Color/LUV.pm b/lib/Convert/Color/LUV.pm
index 886deb7..76d9b8f 100644
--- a/lib/Convert/Color/LUV.pm
+++ b/lib/Convert/Color/LUV.pm
@@ -10,11 +10,16 @@ use Convert::Color::XYZ;
 our $VERSION = '0.001';
 
 use constant +{ ## no critic (Capitalization)
-	KAPPA => 903.2962962,
-	EPS => 0.0088564516,
+	KAPPA => (29/3) ** 3,
+	EPS => (6/29) ** 3,
 
-	REF_U => 0.19783000664283,
-	REF_V => 0.46831999493879,
+	REF_X => 3127/3290,
+	REF_Z => 3583/3290,
+};
+
+use constant +{ ## no critic (Capitalization)
+	REF_U => 4 * REF_X / (REF_X + 15 + 3 * REF_Z),
+	REF_V => 9         / (REF_X + 15 + 3 * REF_Z),
 };
 
 __PACKAGE__->register_color_space('luv');