Added HSL and HSV colors

RGB.go

@@ -2,9 +2,13 @@ package color
 
 import "math"
 
-// RGB creates a new color with red, green and blue values in the range of 0.0 to 1.0.
+// RGB creates a new sRGB color.
 func RGB(r Value, g Value, b Value) Color {
-	return Color{r, g, b}
+	return Color{
+		byte(sRGB(r) * 255),
+		byte(sRGB(g) * 255),
+		byte(sRGB(b) * 255),
+	}
 }
 
 // inSRGB indicates whether the given color can be mapped to the sRGB color space.