Added more tests

RGB.go

@@ -0,0 +1,32 @@
+package color
+
+import "math"
+
+// RGB creates a new color with red, green and blue values in the range of 0.0 to 1.0.
+func RGB(r Value, g Value, b Value) Color {
+	return Color{r, g, b}
+}
+
+// inSRGB indicates whether the given color can be mapped to the sRGB color space.
+func inSRGB(l Value, a Value, b Value, chroma Value) bool {
+	r, g, b := oklabToLinearRGB(l, a*chroma, b*chroma)
+	return r >= 0 && g >= 0 && b >= 0 && r <= 1 && g <= 1 && b <= 1
+}
+
+// sRGB performs gamma correction to convert linear RGB to sRGB.
+// Source: IEC 61966-2-2
+func sRGB(x Value) Value {
+	if x < 0 {
+		return 0
+	}
+
+	if x < 0.0031308 {
+		return 12.92 * x
+	}
+
+	if x < 1.0 {
+		return 1.055*math.Pow(x, 1/2.4) - 0.055
+	}
+
+	return 1.0
+}