Index: trunk/ppMerge/src/ppMergeLoop_Threaded.c
===================================================================
--- trunk/ppMerge/src/ppMergeLoop_Threaded.c	(revision 21139)
+++ trunk/ppMerge/src/ppMergeLoop_Threaded.c	(revision 21183)
@@ -54,6 +54,6 @@
 
     // set the mask and mark bit values based on the named masks
-    psMaskType maskVal;
-    psMaskType markVal;
+    psImageMaskType maskVal;
+    psImageMaskType markVal;
     if (!pmConfigMaskSetBits (&maskVal, &markVal, config)) {
         psError (PS_ERR_UNKNOWN, true, "Unable to define the mask bit values");
@@ -257,5 +257,5 @@
                       psArrayAdd(job->args, 1, psScalarAlloc(iter, PS_TYPE_S32));
                       psArrayAdd(job->args, 1, psScalarAlloc(rej, PS_TYPE_F32));
-                      psArrayAdd(job->args, 1, psScalarAlloc(maskVal, PS_TYPE_U8));
+                      psArrayAdd(job->args, 1, psScalarAlloc(maskVal, PS_TYPE_IMAGE_MASK));
 
                       // call: pmDarkCombine(outCell, fileGroup->readouts, iter, rej, maskVal);
@@ -276,5 +276,5 @@
                       psArrayAdd(job->args, 1, psScalarAlloc(iter, PS_TYPE_S32));
                       psArrayAdd(job->args, 1, psScalarAlloc(rej, PS_TYPE_F32));
-                      psArrayAdd(job->args, 1, psScalarAlloc(maskVal, PS_TYPE_U8));
+                      psArrayAdd(job->args, 1, psScalarAlloc(maskVal, PS_TYPE_IMAGE_MASK));
 
                       // call: pmShutterCorrectionGenerate(outRO, pattern, fileGroup->readouts, shutterRef,