Index: tools/dump_ciede2000.py
diff --git a/tools/dump_ciede2000.py b/tools/dump_ciede2000.py
index 388882c86b560b66ada08a5d9212a8458c1adfe2..80b6b6ad3e308443aa8c49130f31fa08b5d6802f 100755
--- a/tools/dump_ciede2000.py
+++ b/tools/dump_ciede2000.py
@@ -14,6 +14,7 @@ yuv2rgb = np.array([
 # Simple box filter
 box2 = np.ones((2, 2))
 
+box1 = np.ones((1, 2))
 
 def usage():
     print("Usage: %s <video1> <video2>\n"
@@ -23,15 +24,22 @@ def decode_y4m_buffer(frame):
     W, H = frame.headers['W'], frame.headers['H']
     Wdiv2, Hdiv2 = W // 2, H // 2
     C, buf = frame.headers['C'], frame.buffer
-    A, Adiv2, div2 = W * H, Hdiv2 * Wdiv2, (Hdiv2, Wdiv2)
+    A = W * H
     dtype, scale = 'uint8', 1.
     if C.endswith('p10'):
+        # TODO 420p10 and 422p10
         dtype, scale, A = 'uint16', 4., A * 2
     Y = (np.ndarray((H, W), dtype, buf) - 16. * scale) / (219. * scale)
     if C.startswith('420'):
-        Cb = (np.ndarray(div2, dtype, buf, A) - 128. * scale) / (224. * scale)
-        Cr = (np.ndarray(div2, dtype, buf, A + Adiv2) - 128. * scale) / (224. * scale)
+        A_420 = Hdiv2 * Wdiv2
+        Cb = (np.ndarray((Hdiv2, Wdiv2), dtype, buf, A) - 128. * scale) / (224. * scale)
+        Cr = (np.ndarray((Hdiv2, Wdiv2), dtype, buf, A + A_420) - 128. * scale) / (224. * scale)
         YCbCr444 = np.dstack((Y, np.kron(Cb, box2), np.kron(Cr, box2)))
+    elif C.startswith('422'):
+        A_422 = H * Wdiv2
+        Cb = (np.ndarray((H, Wdiv2), dtype, buf, A) - 128. * scale) / (224. * scale)
+        Cr = (np.ndarray((H, Wdiv2), dtype, buf, A + A_422) - 128. * scale) / (224. * scale)
+        YCbCr444 = np.dstack((Y, np.kron(Cb, box1), np.kron(Cr, box1)))
     else:
         Cb = (np.ndarray((H, W), dtype, buf, A) - 128. * scale) / (224. * scale)
         Cr = (np.ndarray((H, W), dtype, buf, A * 2) - 128. * scale) / (224. * scale)
@@ -74,6 +82,8 @@ class Reader(y4m.Reader):
         C = self._stream_headers['C']
         if C.startswith('420'):
             pixels = area * 3 // 2
+        elif C.startswith('422'):
+            pixels = area * 2
         elif C.startswith('444'):
             pixels = area * 3
         else: