Index: /trunk/ippconfig/recipes/reductionClasses.mdc
===================================================================
--- /trunk/ippconfig/recipes/reductionClasses.mdc	(revision 29588)
+++ /trunk/ippconfig/recipes/reductionClasses.mdc	(revision 29589)
@@ -160,5 +160,28 @@
 	BACKGROUND_PPBACKGROUND	STR	BACKGROUND
 	BACKGROUND_PSWARP	STR	BACKGROUND
-
+END
+
+# reduction class specifically for warpwarp diffs:
+WARPWARP	METADATA
+	DIFF_PPSUB	STR	WARPWARP
+	DIFF_PSPHOT	STR	DIFF
+	JPEG_BIN1	STR	PPIMAGE_J1
+	JPEG_BIN2	STR	PPIMAGE_J2
+END
+
+# reduction class specifically for warpstack diffs:
+WARPSTACK	METADATA
+	DIFF_PPSUB	STR	WARPSTACK
+	DIFF_PSPHOT	STR	DIFF
+	JPEG_BIN1	STR	PPIMAGE_J1
+	JPEG_BIN2	STR	PPIMAGE_J2
+END
+
+# reduction class specifically for warpwarp diffs:
+STACKSTACK	METADATA
+	DIFF_PPSUB	STR	STACKSTACK
+	DIFF_PSPHOT	STR	DIFF
+	JPEG_BIN1	STR	PPIMAGE_J1
+	JPEG_BIN2	STR	PPIMAGE_J2
 END