Index: trunk/psLib/src/imageops/psImageBinning.c
===================================================================
--- trunk/psLib/src/imageops/psImageBinning.c	(revision 14983)
+++ trunk/psLib/src/imageops/psImageBinning.c	(revision 14988)
@@ -8,6 +8,6 @@
  *  @author Eugene Magnier, IfA
  *
- *  @version $Revision: 1.4 $ $Name: not supported by cvs2svn $
- *  @date $Date: 2007-09-22 03:05:50 $
+ *  @version $Revision: 1.5 $ $Name: not supported by cvs2svn $
+ *  @date $Date: 2007-09-24 02:59:46 $
  *
  *  Copyright 2007 Institute for Astronomy, University of Hawaii
@@ -88,4 +88,11 @@
         binning->nYskip = 0 - binning->nYoff;
     }
+    return;
+}
+
+void psImageBinningSetSkipByOffset(psImageBinning *binning, int col0, int row0) {
+
+    binning->nXskip = col0 - binning->nXoff;
+    binning->nYskip = row0 - binning->nYoff;
     return;
 }
Index: trunk/psLib/src/imageops/psImageBinning.h
===================================================================
--- trunk/psLib/src/imageops/psImageBinning.h	(revision 14983)
+++ trunk/psLib/src/imageops/psImageBinning.h	(revision 14988)
@@ -8,6 +8,6 @@
  *  @author Eugene Magnier, IfA
  *
- *  @version $Revision: 1.3 $ $Name: not supported by cvs2svn $
- *  @date $Date: 2007-09-20 23:53:48 $
+ *  @version $Revision: 1.4 $ $Name: not supported by cvs2svn $
+ *  @date $Date: 2007-09-24 02:59:46 $
  *
  *  Copyright 2007 Institute for Astronomy, University of Hawaii
@@ -48,4 +48,6 @@
 void psImageBinningSetScale(psImageBinning *binning, psImageBinningAlign align);
 void psImageBinningSetSkip(psImageBinning *binning, psImage *image);
+void psImageBinningSetSkipByOffset(psImageBinning *binning, int col0, int row0);
+
 psRegion psImageBinningSetFineRegion (psImageBinning *binning, psRegion ruffRegion);
 psRegion psImageBinningSetRuffRegion (psImageBinning *binning, psRegion fineRegion);
Index: trunk/psLib/src/imageops/psImageMap.c
===================================================================
--- trunk/psLib/src/imageops/psImageMap.c	(revision 14983)
+++ trunk/psLib/src/imageops/psImageMap.c	(revision 14988)
@@ -7,6 +7,6 @@
  *  @author Eugene Magnier, IfA
  *
- *  @version $Revision: 1.3 $ $Name: not supported by cvs2svn $
- *  @date $Date: 2007-09-22 03:05:50 $
+ *  @version $Revision: 1.4 $ $Name: not supported by cvs2svn $
+ *  @date $Date: 2007-09-24 02:59:46 $
  *
  *  Copyright 2007 Institute for Astronomy, University of Hawaii
@@ -69,4 +69,26 @@
     psImageBinningSetScale (map->binning, PS_IMAGE_BINNING_CENTER);
     psImageBinningSetSkip (map->binning, map->field);
+
+    return map;
+}
+
+// allocate the image map using the psImageBinning supplied
+psImageMap *psImageMapNoImageAlloc(psImageBinning *binning, psStats *stats) {
+
+    assert (binning);
+    assert (stats);
+
+    psImageMap *map = (psImageMap*)psAlloc(sizeof(psImageMap));
+    psMemSetDeallocator(map, (psFreeFunc)psImageMapFree);
+
+    map->field   = NULL;
+    map->stats   = psMemIncrRefCounter (stats);
+    map->binning = psMemIncrRefCounter (binning);
+
+    map->map     = psImageAlloc (binning->nXruff, binning->nYruff, PS_TYPE_F32);
+    psImageInit (map->map, 0.0);
+
+    map->error   = psImageAlloc (binning->nXruff, binning->nYruff, PS_TYPE_F32);
+    psImageInit (map->error, 0.0);
 
     return map;
Index: trunk/psLib/src/imageops/psImageMap.h
===================================================================
--- trunk/psLib/src/imageops/psImageMap.h	(revision 14983)
+++ trunk/psLib/src/imageops/psImageMap.h	(revision 14988)
@@ -7,6 +7,6 @@
  *  @author Eugene Magnier, IfA
  *
- *  @version $Revision: 1.2 $ $Name: not supported by cvs2svn $
- *  @date $Date: 2007-09-20 23:54:25 $
+ *  @version $Revision: 1.3 $ $Name: not supported by cvs2svn $
+ *  @date $Date: 2007-09-24 02:59:46 $
  *
  *  Copyright 2007 Institute for Astronomy, University of Hawaii
@@ -36,4 +36,6 @@
 psImageMap *psImageMapAlloc(psImage *field, psImageBinning *binning, psStats *stats) PS_ATTR_MALLOC;
 
+psImageMap *psImageMapNoImageAlloc(psImageBinning *binning, psStats *stats) PS_ATTR_MALLOC;
+
 bool psImageMapModifyScale(psImageMap *map, int nXruff, int nYruff);