Index: trunk/psLib/src/imageops/psImageBackground.c
===================================================================
--- trunk/psLib/src/imageops/psImageBackground.c	(revision 27066)
+++ trunk/psLib/src/imageops/psImageBackground.c	(revision 27067)
@@ -52,5 +52,5 @@
     for (int y = 0; y < ny; y++) {
         for (int x = 0; x < nx; x++) {
-            if (!isfinite(image->data.F32[iy][ix]) ||
+            if (!isfinite(image->data.F32[y][x]) ||
                 (mask && mask->data.PS_TYPE_IMAGE_MASK_DATA[iy][ix] & maskValue)) {
                 bad->data.U8[y][x] = 0xFF;