Index: trunk/psModules/src/camera/pmReadoutStack.c
===================================================================
--- trunk/psModules/src/camera/pmReadoutStack.c	(revision 24794)
+++ trunk/psModules/src/camera/pmReadoutStack.c	(revision 24843)
@@ -263,7 +263,13 @@
         pmCell *cell = readout->parent; // The parent cell
         bool mdok = true;       // Status of MD lookup
-        psRegion *trimsec = psMetadataLookupPtr(&mdok, cell->concepts, "CELL.TRIMSEC"); // Trim section
+        psRegion *trimsec = cell ? psMetadataLookupPtr(&mdok, cell->concepts, "CELL.TRIMSEC") : NULL; // Trim section
         if (!mdok || !trimsec || psRegionIsNaN(*trimsec)) {
-            psWarning("CELL.TRIMSEC is not set for readout %ld --- ignored.\n", i);
+            psWarning("CELL.TRIMSEC is not set for readout %ld --- attempting to use image size.\n", i);
+            xSize = PS_MAX(xSize, readout->image->numCols);
+            ySize = PS_MAX(ySize, readout->image->numRows);
+            xMin = PS_MIN(xMin, 0);
+            xMax = PS_MAX(xMax, readout->image->numCols - 1);
+            yMin = PS_MIN(yMin, 0);
+            yMax = PS_MAX(yMax, readout->image->numRows - 1);
         } else {
             xSize = PS_MAX(xSize, trimsec->x1 - trimsec->x0);