Index: trunk/ippconfig/recipes/ppSub.config
===================================================================
--- trunk/ippconfig/recipes/ppSub.config	(revision 40603)
+++ trunk/ippconfig/recipes/ppSub.config	(revision 41382)
@@ -17,4 +17,5 @@
 NORM.FRAC	F32	0.02		# Fraction of window for normalisation window
 COVAR.FRAC	F32	0.01		# Fraction of kernel to truncate before calculating covariance
+APPLY.PIXELNAN	BOOL	TRUE		# Apply NAN'ing of pixels underneath masks
 
 MASK.VAL	STR	MASK.VALUE,CONV.BAD	# Mask value for input