Index: trunk/ppSub/src/ppSubBackground.c
===================================================================
--- trunk/ppSub/src/ppSubBackground.c	(revision 20614)
+++ trunk/ppSub/src/ppSubBackground.c	(revision 20775)
@@ -62,5 +62,5 @@
                 image->data.F32[y][x] = 0.0;
             } else {
-                float value = psImageUnbinPixel_V2(x, y, modelImage, binning); // Background value
+                float value = psImageUnbinPixel(x + 0.5, y + 0.5, modelImage, binning); // Background value
                 if (!isfinite(value)) {
                     image->data.F32[y][x] = NAN;