Index: trunk/psphot/src/psphotDeblendSatstars.c
===================================================================
--- trunk/psphot/src/psphotDeblendSatstars.c	(revision 24878)
+++ trunk/psphot/src/psphotDeblendSatstars.c	(revision 24889)
@@ -1,5 +1,5 @@
 # include "psphotInternal.h"
 
-bool psphotDeblendSatstars (psArray *sources, psMetadata *recipe) {
+bool psphotDeblendSatstars (pmReadout *readout, psArray *sources, psMetadata *recipe) {
 
     int N;
@@ -9,6 +9,10 @@
 
     int Nblend = 0;
-    float SAT_TEST_LEVEL = 50000;
     float SAT_MIN_RADIUS = 5.0;
+
+    bool status;
+    pmCell *cell = readout->parent;
+    float SATURATION = 0.75*psMetadataLookupF32 (&status, cell->concepts, "CELL.SATURATION");
+    float SAT_TEST_LEVEL = 0.5*SATURATION;
 
     // we need sources spatially-sorted to find overlaps
@@ -32,5 +36,5 @@
         // XXX filter? if (source->mode & PM_SOURCE_MODE_SATSTAR) continue;
         if (source->mode & PM_SOURCE_MODE_BLEND) continue;
-        if (source->peak->flux < SAT_TEST_LEVEL) continue;
+        if (source->peak->flux < SATURATION) continue;
 
 	// save these for reference below
@@ -45,6 +49,5 @@
 	psVector *xVec = contour->data[0];
 	psVector *yVec = contour->data[1];
-
-	// XXX should we filter based on the number of pixels in the contour?
+	if (xVec->n < 5) continue;
 
 	// find the center of the contour (let's just use mid[x,y])
@@ -62,4 +65,9 @@
 	int yCenter = 0.5*(yMin + yMax);
 	psFree (contour);
+
+	psAssert (xCenter >= source->pixels->col0, "invalid shift in object center");
+	psAssert (xCenter <  source->pixels->col0 + source->pixels->numCols, "invalid shift in object center");
+	psAssert (yCenter >= source->pixels->row0, "invalid shift in object center");
+	psAssert (yCenter <  source->pixels->row0 + source->pixels->numRows, "invalid shift in object center");
 
 	// reset the peak for this source to the value of the center pixel