diff --git a/lib/term/ansicolor/hsl_triple.rb b/lib/term/ansicolor/hsl_triple.rb
index 3babaa7..ccd93cc 100644
--- a/lib/term/ansicolor/hsl_triple.rb
+++ b/lib/term/ansicolor/hsl_triple.rb
@@ -2,7 +2,7 @@ module Term
   module ANSIColor
     class HSLTriple
       def self.from_rgb_triple(rgb)
-        ps = rgb.to_a.map { |x| x / 255.0 }
+        ps = [ rgb.red / 255.0, rgb.green / 255.0, rgb.blue / 255.0 ]
         p_min = ps.min
         p_max = ps.max
         p_red, p_green, p_blue = ps
diff --git a/lib/term/ansicolor/rgb_color_metrics.rb b/lib/term/ansicolor/rgb_color_metrics.rb
index f297de0..7c789bc 100644
--- a/lib/term/ansicolor/rgb_color_metrics.rb
+++ b/lib/term/ansicolor/rgb_color_metrics.rb
@@ -19,16 +19,16 @@ def normalize(v)
           if v <= 0.04045
             v / 12
           else
-            ( (v + 0.055) / 1.055) ** 2.4
+            ( (v + 0.055) / 1.055 ) ** 2.4
           end
         end
 
         def normalize_rgb_triple(rgb_triple)
           [
-            rgb_triple.red,
-            rgb_triple.green,
-            rgb_triple.blue
-          ].map { |v| normalize(v) }
+            normalize(rgb_triple.red),
+            normalize(rgb_triple.green),
+            normalize(rgb_triple.blue),
+          ]
         end
       end
     end
diff --git a/lib/term/ansicolor/rgb_triple.rb b/lib/term/ansicolor/rgb_triple.rb
index e5c63d5..12d6c24 100644
--- a/lib/term/ansicolor/rgb_triple.rb
+++ b/lib/term/ansicolor/rgb_triple.rb
@@ -59,7 +59,11 @@ def self.[](thing)
       end
 
       def initialize(red, green, blue)
-        @values = [ red, green, blue ].map! { |v| v.clamp(0, 0xff) }
+        @values = [
+          red.clamp(0, 0xff),
+          green.clamp(0, 0xff),
+          blue.clamp(0, 0xff),
+        ]
       end
 
       def red
@@ -106,7 +110,7 @@ def html
 
       def css(percentage: false)
         if percentage
-          "rgb(%s%%,%s%%,%s%%)" % @values.map { |v| 100.0 * v / 255 }
+          "rgb(%s%%,%s%%,%s%%)" % percentages
         else
           "rgb(%u,%u,%u)" % @values
         end