Index: trunk/ippconfig/recipes/ppSub.config
===================================================================
--- trunk/ippconfig/recipes/ppSub.config	(revision 38062)
+++ trunk/ippconfig/recipes/ppSub.config	(revision 38064)
@@ -77,5 +77,5 @@
 PHOTOMETRY	BOOL	FALSE		# Perform photometry?
 NOCONVOLVE      BOOL    FALSE           # Skip convolution?
-
+CHIP.MAP.FROM.POSITIVE BOOL FALSE       # use the warp for the chipmap, not subtrahend
 
 FORCED.PHOTOMETRY.BOTH BOOL FALSE       # forced photometry on input sources?
@@ -184,8 +184,9 @@
 # WSdiff for PV3 to do inverse phot
 WARPSTACK_PV3       METADATA
-        DUAL            BOOL    FALSE   # Dual convolution?
-        INVERSE         BOOL    TRUE   # Generate inverse subtraction?
-        PHOTOMETRY      BOOL    TRUE    # Perform photometry?
-        CONVOLVE.TARGET STR     SINGLE2 # convolution direction
+        DUAL                   BOOL    FALSE   # Dual convolution?
+        INVERSE                BOOL    TRUE    # Generate inverse subtraction?
+        PHOTOMETRY             BOOL    TRUE    # Perform photometry?
+        CONVOLVE.TARGET        STR     SINGLE2 # convolution direction
+	CHIP.MAP.FROM.POSITIVE BOOL    FALSE   # always use the warp for the chipmap, not subtrahend
 END