Index: trunk/psModules/src/camera/pmFPARead.c
===================================================================
--- trunk/psModules/src/camera/pmFPARead.c	(revision 10081)
+++ trunk/psModules/src/camera/pmFPARead.c	(revision 10705)
@@ -431,4 +431,13 @@
     }
 
+    // rationalize trimsec against naxis1, naxis2
+    // valid range for trimsec is 1-Nx,1-Ny
+    // if (trimsec->x0 == 0) trimsec->x0 = 1;
+    if (trimsec->x1 <  1)
+        trimsec->x1 = naxis1 + trimsec->x1;
+    // if (trimsec->y0 == 0) trimsec->y0 = 1;
+    if (trimsec->y1 <  1)
+        trimsec->y1 = naxis2 + trimsec->y1;
+
     int maxSize;                        // Number of cols,rows in image
     if (readdir == 1) {