Index: trunk/psModules/src/imcombine/pmSubtractionMatch.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 14835)
+++ trunk/psModules/src/imcombine/pmSubtractionMatch.c	(revision 15267)
@@ -166,4 +166,13 @@
     // Don't care about maskBlank
 
+    // If the stamp footprint is smaller than the kernel size, then we won't get much signal in the outer
+    // parts of the kernel, which can result in bad matching artifacts.
+    if (footprint < size) {
+        psError(PS_ERR_BAD_PARAMETER_VALUE, true,
+                "Stamp footprint (%d) should be larger than or equal to the kernel size (%d)",
+                footprint, size);
+        return false;
+    }
+
     // Reset the output readout, just in case
     if (convolved->image) {