diff --git a/main.go b/main.go
index 2854327..92f76f5 100644
--- a/main.go
+++ b/main.go
@@ -72,18 +72,49 @@ func LinearCongruentialGenerator(seed uint64) *LCG {
 	return g
 }
 
-type COLOR struct {
+type RGB struct {
 	r uint8
 	g uint8
 	b uint8
 }
 
-func Color(s string) *COLOR {
-	c := new(COLOR)
+type HSV struct {
+	h float32
+	s float32
+	v float32
+}
+
+func rgb(r, g, b float32) *RGB {
+	c := new(RGB)
+	c.r = uint8(r * 1.0 / 255)
+	c.g = uint8(g * 1.0 / 255)
+	c.b = uint8(b * 1.0 / 255)
+	return c
+}
+
+func s2rgb(s string) *RGB {
+	c := new(RGB)
 	fmt.Sscanf(s, "#%02x%02x%02x", c.r, c.g, c.b)
 	return c
 }
 
+func (c *HSV) to_rgb() *RGB {
+        h := int(floor(c.h / 60))
+	f := c.h / 60 - h
+	p := c.v * (1 - c.s)
+	q := c.v * (1 - c.s * f)
+	t := c.v * (1 - c.s * (1 - f))
+	switch (h) {
+	case 6:
+	case 0: return rgb(C.V, t, p)
+	case 1: return rgb(q, C.V, p)
+	case 2: return rgb(p, C.V, t)
+	case 3: return rgb(p, q, C.V)
+	case 4: return rgb(t, p, C.V)
+	case 5: return rgb(C.V, p, q)
+	}
+}
+
 func add255(x uint8, y uint8) uint8 {
 	if x < 255-y {
 		return x + y
@@ -98,7 +129,7 @@ func sub255(x uint8, y uint8) uint8 {
 	return 0
 }
 
-func (c *COLOR) brighterOrDarkerThan(ref COLOR, delta uint8) string {
+func (c *RGB) brighterOrDarkerThan(ref RGB, delta uint8) string {
 	/* XXX FIXME: THIS IS PROBABLY NOT CORRECT. Need to look into original implementation. */
 	if true {
 		return fmt.Sprintf("#%02x%02x%02x", add255(c.r, delta), add255(c.g, delta), add255(c.b, delta))
@@ -106,26 +137,26 @@ func (c *COLOR) brighterOrDarkerThan(ref COLOR, delta uint8) string {
 	return ref.darkerThan(ref, delta)
 }
 
-func (c *COLOR) darkerThan(ref COLOR, delta uint8) string {
+func (c *RGB) darkerThan(ref RGB, delta uint8) string {
 	/* XXX FIXME: THIS IS NOT CORRECT. The original implementation does darkening in HSV space.
 	 * cf. https://github.com/DiceBear/avatars/blob/master/packages/avatars/src/color.ts
 	 */
 	return fmt.Sprintf("#%02x%02x%02x", sub255(c.r, delta), sub255(c.g, delta), sub255(c.b, delta))
 }
 
-func (c COLOR) withAlpha(alpha float32) string {
+func (c RGB) withAlpha(alpha float32) string {
 	return fmt.Sprintf("#%02x%02x%02x", c.r, c.g, c.b, uint8(255*alpha))
 }
 
 func maleAvatar(seed uint64) string {
 	var g = LinearCongruentialGenerator(seed)
 	var skinColor = g.pickOne([]string{"#FFDBAC", "#F5CFA0", "#EAC393", "#E0B687", "#CB9E6E", "#B68655", "#A26D3D", "#8D5524"})
-	var hairColor = Color(g.pickOne([]string{"#090806", "#2c222b", "#71635a", "#b7a69e", "#b89778", "#a56b46", "#b55239", "#8d4a43",
-		"#91553d", "#533d32", "#3b3024", "#554838", "#4e433f", "#504444", "#6a4e42", "#a7856a", "#977961"})).brighterOrDarkerThan(*Color(skinColor), 17)
+	var hairColor = rgb(g.pickOne([]string{"#090806", "#2c222b", "#71635a", "#b7a69e", "#b89778", "#a56b46", "#b55239", "#8d4a43",
+		"#91553d", "#533d32", "#3b3024", "#554838", "#4e433f", "#504444", "#6a4e42", "#a7856a", "#977961"})).brighterOrDarkerThan(*rgb(skinColor), 17)
 	var eyesColor = g.pickOne([]string{"#76778b", "#697b94", "#647b90", "#5b7c8b", "#588387"})
-	var eyebrowsColor = Color(Color(hairColor).darkerThan(*Color(skinColor), 7)).darkerThan(*Color(hairColor), 10)
-	var mustacheColor = Color(Color(hairColor).darkerThan(*Color(skinColor), 7)).withAlpha(g.pickOneFloat([]float32{1, 0.75, 0.5}))
-	var mouthColor = Color(g.pickOne([]string{"#eec1ad", "#dbac98", "#d29985"})).brighterOrDarkerThan(*Color(skinColor), 10)
+	var eyebrowsColor = rgb(rgb(hairColor).darkerThan(*rgb(skinColor), 7)).darkerThan(*rgb(hairColor), 10)
+	var mustacheColor = rgb(rgb(hairColor).darkerThan(*rgb(skinColor), 7)).withAlpha(g.pickOneFloat([]float32{1, 0.75, 0.5}))
+	var mouthColor = rgb(g.pickOne([]string{"#eec1ad", "#dbac98", "#d29985"})).brighterOrDarkerThan(*rgb(skinColor), 10)
 	var glassesColor = g.pickOne([]string{"#5f705c", "#43677d", "#5e172d", "#ffb67a", "#a04b5d", "#191919", "#323232", "#4b4b4b"})
 	var clothesColor = g.pickOne([]string{"#5bc0de", "#5cb85c", "#428bca", "#03396c", "#005b96", "#6497b1", "#1b85b8", "#5a5255", "#559e83", "#ae5a41", "#c3cb71", "#666547", "#ffe28a"})
 	var hatColor = g.pickOne([]string{"#18293b", "#2e1e05", "#989789", "#3d6ba7", "#517459", "#a62116"})
@@ -281,13 +312,13 @@ func femaleAvatar(seed uint64) string {
 	var g = LinearCongruentialGenerator(seed)
 
 	var skinColor = g.pickOne([]string{"#FFDBAC", "#F5CFA0", "#EAC393", "#E0B687", "#CB9E6E", "#B68655", "#A26D3D", "#8D5524"})
-	var hairColor = Color(g.pickOne([]string{"#090806", "#2c222b", "#71635a", "#b7a69e", "#d6c4c2", "#cabfb1", "#dcd0ba", "#fff5e1",
+	var hairColor = rgb(g.pickOne([]string{"#090806", "#2c222b", "#71635a", "#b7a69e", "#d6c4c2", "#cabfb1", "#dcd0ba", "#fff5e1",
 		"#e6cea8", "#e5c8a8", "#debc99", "#b89778", "#a56b46", "#b55239", "#8d4a43", "#91553d",
-		"#533d32", "#3b3024", "#554838", "#4e433f", "#504444", "#6a4e42", "#a7856a", "#977961"})).brighterOrDarkerThan(*Color(skinColor), 17)
+		"#533d32", "#3b3024", "#554838", "#4e433f", "#504444", "#6a4e42", "#a7856a", "#977961"})).brighterOrDarkerThan(*rgb(skinColor), 17)
 	var eyesColor = g.pickOne([]string{"#76778b", "#697b94", "#647b90", "#5b7c8b", "#588387"})
-	var eyebrowsColor = Color(Color(hairColor).darkerThan(*Color(skinColor), 7)).darkerThan(*Color(hairColor), 10)
+	var eyebrowsColor = rgb(rgb(hairColor).darkerThan(*rgb(skinColor), 7)).darkerThan(*rgb(hairColor), 10)
 	var accessoriesColor = g.pickOne([]string{"#daa520", "#ffd700", "#eee8aa", "#fafad2", "#d3d3d3", "#a9a9a9"})
-	var mouthColor = Color(g.pickOne([]string{"#dbac98", "#d29985", "#c98276", "#e35d6a", "#e32153", "#de0f0d"})).brighterOrDarkerThan(*Color(skinColor), 10)
+	var mouthColor = rgb(g.pickOne([]string{"#dbac98", "#d29985", "#c98276", "#e35d6a", "#e32153", "#de0f0d"})).brighterOrDarkerThan(*rgb(skinColor), 10)
 	var glassesColor = g.pickOne([]string{"#5f705c", "#43677d", "#5e172d", "#ffb67a", "#a04b5d", "#191919", "#323232", "#4b4b4b"})
 	var clothesColor = g.pickOne([]string{"#d11141", "#00b159", "#00aedb", "#f37735", "#ffc425", "#740001", "#ae0001", "#eeba30",
 		"#96ceb4", "#ffeead", "#ff6f69", "#ffcc5c", "#88d8b0"})