Index: trunk/pstamp/src/ppstampMakeStamp.c
===================================================================
--- trunk/pstamp/src/ppstampMakeStamp.c	(revision 40389)
+++ trunk/pstamp/src/ppstampMakeStamp.c	(revision 41540)
@@ -66,5 +66,5 @@
     } else {
         outChip->toFPA     = psPlaneTransformSetCenter(NULL, inChip->toFPA, (int) roi->x0, (int) roi->y0);
-        outChip->fromFPA   = psPlaneTransformInvert(NULL, outChip->toFPA, *roi, 50);
+        outChip->fromFPA   = psPlaneTransformInvert(NULL, outChip->toFPA, *roi, 50, 4);
         if (!outChip->fromFPA) {
             psError(PS_ERR_UNKNOWN, false, "inversion of toFPA transform failed");