Fix JzAzBz to XYZ conversion

src/jab/convertJabToXyz65.js

@@ -15,19 +15,23 @@ const rel = v => v / 203;
 export default ({ j, a, b, alpha }) => {
 	let i = (j + d0) / (0.44 + 0.56 * (j + d0));
 
-	let l = pq_inv(i + 0.138605 * a + 0.0580473 * b);
-	let m = pq_inv(i - 0.138605 * a - 0.0580473 * b);
-	let s = pq_inv(i - 0.0960192 * a - 0.811892 * b);
-
-	let xp = 1.92423 * l - 1.00479 * m + 0.0376514 * s;
-	let yp = 0.350317 * l + 0.726481 * m - 0.0653844 * s;
-	let z = -0.0909828 * l - 0.312728 * m + 1.52277 * s;
+	let l = pq_inv(i + 0.13860504 * a + 0.058047316 * b);
+	let m = pq_inv(i - 0.13860504 * a - 0.058047316 * b);
+	let s = pq_inv(i - 0.096019242 * a - 0.8118919 * b);
 
 	let res = {
 		mode: 'xyz65',
-		x: rel((xp + 0.15 * z) / 1.15),
-		y: rel((yp - 0.34 * x) / 0.66),
-		z: rel(z)
+		x: rel(
+			1.661373024652174 * l -
+				0.914523081304348 * m +
+				0.23136208173913045 * s
+		),
+		y: rel(
+			-0.3250758611844533 * l +
+				1.571847026732543 * m -
+				0.21825383453227928 * s
+		),
+		z: rel(-0.090982811 * l - 0.31272829 * m + 1.5227666 * s)
 	};
 
 	if (alpha !== undefined) {

test/jab.test.js

@@ -1,5 +1,5 @@
 import tape from 'tape';
-import { jab, xyz, xyz65, mapper } from '../src/index';
+import { jab, formatHex } from '../src/index';
 
 tape('jab', t => {
 	t.deepEqual(
@@ -26,3 +26,8 @@ tape('jab', t => {
 	);
 	t.end();
 });
+
+tape('rgb -> jab -> rgb', t => {
+	t.equal(formatHex(jab('#cc3302')), '#cc3302', '#cc3302');
+	t.end();
+});