Index: trunk/ppStack/src/ppStackPrepare.c
===================================================================
--- trunk/ppStack/src/ppStackPrepare.c	(revision 35931)
+++ trunk/ppStack/src/ppStackPrepare.c	(revision 36855)
@@ -148,4 +148,9 @@
     }
 
+    //MEH -- bscale offset hack for warps 
+    options->bscaleOffset = psVectorAlloc(options->num, PS_TYPE_F32);
+    psVectorInit(options->bscaleOffset, 0.0);
+    bool setbscaleoffset = psMetadataLookupBool(NULL,recipe, "BSCALEOFFSET");
+
     psArray *psfs = psArrayAlloc(num); // PSFs for PSF envelope
     int numCols = 0, numRows = 0;   // Size of image
@@ -162,4 +167,13 @@
 	}
         options->sumExposure += options->exposures->data.F32[i];
+
+        //MEH -- hdu get redefn again below if conv (lots of this happening..) 
+        if (setbscaleoffset) {
+            pmHDU *hdu = pmHDUFromCell(cell);
+            assert(hdu && hdu->header);
+            float bscale = psMetadataLookupF32(NULL, hdu->header, "BSCALE");
+            options->bscaleOffset->data.F32[i] = 0.5*bscale;
+        }
+        psLogMsg("ppStack", PS_LOG_INFO, "bscaleOffset: %d %f", i,options->bscaleOffset->data.F32[i]);
 
         // Get list of PSFs, to determine target PSF