From 556d94e4ed035c9f0905a1fe73f34af867be5e31 Mon Sep 17 00:00:00 2001
From: Tyson Brown <tyson@smariot.com>
Date: Tue, 7 May 2024 19:03:31 -0400
Subject: [PATCH] Cosmetic tweak to the Distance function.

---
 oklab.go | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/oklab.go b/oklab.go
index d1121b1..9ede5f3 100644
--- a/oklab.go
+++ b/oklab.go
@@ -140,13 +140,13 @@ func sqr(a float64) float64 {
 }
 
 func Distance(a, b Color) float64 {
-	dL := a.Lightness*a.A - b.Lightness*b.A
-	da := a.ChromaA*a.A - b.ChromaA*b.A
-	db := a.ChromaB*a.A - b.ChromaB*b.A
+	L1, a1, b1 := a.Lightness*a.A, a.ChromaA*a.A, a.ChromaB*a.A
+	L2, a2, b2 := b.Lightness*b.A, b.ChromaA*b.A, b.ChromaB*b.A
+	dL := L1 - L2
+	da := a1 - a2
+	db := b1 - b2
 	dA := a.A - b.A
-
 	return math.Sqrt(max(sqr(dL), sqr(dL+dA)) + max(sqr(da), sqr(da+dA)) + max(sqr(db), sqr(db+dA)))
-	//return math.Sqrt((sqr(dL)+sqr(da)+sqr(db))*(a.A*b.A) + sqr(dA))
 }
 
 func okLabModel(c color.Color) color.Color {