Index: trunk/psLib/src/imageops/psImageBackground.c
===================================================================
--- trunk/psLib/src/imageops/psImageBackground.c	(revision 20216)
+++ trunk/psLib/src/imageops/psImageBackground.c	(revision 21183)
@@ -18,10 +18,10 @@
 // XXX allow the user to choose the stats method?
 // (SAMPLE_MEAN, CLIPPED_MEAN, ROBUST_MEDIAN, FITTED_MEAN)
-bool psImageBackground(psStats *stats, psVector **sample, const psImage *image, const psImage *mask, psMaskType maskValue, psRandom *rng)
+bool psImageBackground(psStats *stats, psVector **sample, const psImage *image, const psImage *mask, psImageMaskType maskValue, psRandom *rng)
 {
     PS_ASSERT_IMAGE_NON_NULL(image, NULL);
     if (mask) {
         PS_ASSERT_IMAGE_NON_NULL(mask, NULL);
-        PS_ASSERT_IMAGE_TYPE(mask, PS_TYPE_U8, NULL);
+        PS_ASSERT_IMAGE_TYPE(mask, PS_TYPE_IMAGE_MASK, NULL);
         PS_ASSERT_IMAGES_SIZE_EQUAL(mask, image, NULL);
     }
@@ -63,5 +63,5 @@
         int iy = pixel / nx;
 
-        if (!isfinite(image->data.F32[iy][ix]) || (mask && mask->data.U8[iy][ix] & maskValue)) {
+        if (!isfinite(image->data.F32[iy][ix]) || (mask && mask->data.PS_TYPE_IMAGE_MASK_DATA[iy][ix] & maskValue)) {
             continue;
         }