Index: trunk/psphot/src/psphotModelBackground.c
===================================================================
--- trunk/psphot/src/psphotModelBackground.c	(revision 15936)
+++ trunk/psphot/src/psphotModelBackground.c	(revision 16820)
@@ -4,5 +4,5 @@
 // generate the median in NxN boxes, clipping heavily
 // linear interpolation to generate full-scale model
-bool psphotModelBackground (pmConfig *config, const pmFPAview *view, const char *filename, psMaskType maskVal)
+bool psphotModelBackground (pmConfig *config, const pmFPAview *view, const char *filename)
 {
     bool status = true;
@@ -20,4 +20,9 @@
     // select the appropriate recipe information
     psMetadata *recipe  = psMetadataLookupPtr (&status, config->recipes, PSPHOT_RECIPE);
+    assert (recipe);
+
+    // user-defined masks to test for good/bad pixels (build from recipe list if not yet set)
+    psMaskType maskVal = psMetadataLookupU8(&status, recipe, "MASK.PSPHOT"); // Mask value for bad pixels
+    assert (maskVal);
 
     // user supplied seed, if available