Index: trunk/ppStack/src/ppStackCombineFinal.c
===================================================================
--- trunk/ppStack/src/ppStackCombineFinal.c	(revision 27402)
+++ trunk/ppStack/src/ppStackCombineFinal.c	(revision 27403)
@@ -30,4 +30,7 @@
     psArray *reject = psArrayAlloc(options->num); // Pixels rejected for each image
     for (int i = 0; i < options->num; i++) {
+        if (options->inputMask->data.U8[i]) {
+            continue;
+        }
         if (grow) {
             reject->data[i] = pmStackRejectGrow(options->rejected->data[i], numCols, numRows, poorFrac,