Index: trunk/psModules/src/imcombine/pmPSFEnvelope.c
===================================================================
--- trunk/psModules/src/imcombine/pmPSFEnvelope.c	(revision 16398)
+++ trunk/psModules/src/imcombine/pmPSFEnvelope.c	(revision 16479)
@@ -31,5 +31,5 @@
 
 
-//#define TESTING                         // Enable test output
+#define TESTING                         // Enable test output
 #define PEAK_FLUX 1.0e3                 // Peak flux for each source
 #define SKY_VALUE 0.0e0                 // Sky value for fake image
@@ -94,5 +94,9 @@
             fake->peak = pmPeakAlloc(xFake - dx, yFake - dy, PEAK_FLUX, PM_PEAK_LONE);
             fake->type = PM_SOURCE_TYPE_STAR;
+
+#ifdef TESTING
+            // Required to generate model image
             fake->psfMag = -2.5 * log10(PEAK_FLUX);
+#endif
 
             psTrace("psModules.imcombine", 5, "Source %d: %.2f,%.2f\n",