diff --git a/colors.lua b/colors.lua
index 0faeb43..f12b545 100644
--- a/colors.lua
+++ b/colors.lua
@@ -22,10 +22,9 @@ colors.rgb_to_hsl = function (color)
 	local b = (color[3] == 255 and 1 or color[3]/256)
 
 	local max, min = math.max(r, g, b), math.min(r, g, b)
+	if min == max then  return { 0, 0, (max+min)/2 }  end
+
 	local h, s, l = (max+min)/2, (max+min)/2, (max+min)/2
-	if min == max then
-		return {0, 0, l}
-	end
 
 	local d = max - min
 	s = l > 0.5 and d / (2 - max - min) or d / (max + min)
@@ -86,7 +85,7 @@ colors.interpolate_rgb = function (c1, c2, t)
 	assert(type(c1) == 'table' and type(c1[1]) == 'number' and type(c1[2]) == 'number' and type(c1[3]) == 'number' and (type(c1[4]) == 'number' or c1[4] == nil))
 	assert(type(c2) == 'table' and type(c2[1]) == 'number' and type(c2[2]) == 'number' and type(c2[3]) == 'number' and (type(c2[4]) == 'number' or c2[4] == nil))
 	assert(type(t) == 'number')
-	--	
+	--
 	local alpha = nil
 	if c1[4] or c2[4] then  alpha = (c1[4] or 255) + ((c2[4] or 255)-(c1[4] or 255))*t  end
 	return { c1[1]+(c2[1]-c1[1])*t, c1[2]+(c2[2]-c1[2])*t, c1[3]+(c2[3]-c1[3])*t, alpha }
@@ -151,3 +150,4 @@ end
 --------------------------------------------------------------------------------
 
 return colors
+