Index: trunk/psModules/src/imcombine/pmSubtractionMatch.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 20505)
+++ trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 20568)
@@ -92,5 +92,5 @@
 
 bool pmSubtractionMatch(pmReadout *conv1, pmReadout *conv2, const pmReadout *ro1, const pmReadout *ro2,
-                        int footprint, float regionSize, float stampSpacing, float threshold,
+                        int footprint, int stride, float regionSize, float stampSpacing, float threshold,
                         const psArray *sources, const char *stampsName,
                         pmSubtractionKernelsType type, int size, int spatialOrder,
@@ -139,4 +139,5 @@
 
     PS_ASSERT_INT_NONNEGATIVE(footprint, false);
+    PS_ASSERT_INT_NONNEGATIVE(stride, false);
     // regionSize can be just about anything (except maybe negative, but it can be NAN)
     PS_ASSERT_FLOAT_LARGER_THAN(stampSpacing, 0.0, false);
@@ -396,5 +397,5 @@
 
             psTrace("psModules.imcombine", 2, "Convolving...\n");
-            if (!pmSubtractionConvolve(conv1, conv2, ro1, ro2, subMask, maskBad, maskPoor, poorFrac,
+            if (!pmSubtractionConvolve(conv1, conv2, ro1, ro2, subMask, stride, maskBad, maskPoor, poorFrac,
                                        sysError, region, kernels, true, useFFT)) {
                 psError(PS_ERR_UNKNOWN, false, "Unable to convolve image.");