Index: trunk/ppImage/src/ppImageOptions.c
===================================================================
--- trunk/ppImage/src/ppImageOptions.c	(revision 21364)
+++ trunk/ppImage/src/ppImageOptions.c	(revision 23229)
@@ -81,4 +81,7 @@
     options->remnanceThresh  = 25.0;    // Threshold for remnance detection
 
+    // per-class normalization source
+    options->normClass       = NULL;    // per-class normalizations refer to this class
+
     return options;
 }
@@ -278,4 +281,7 @@
     options->remnanceThresh = psMetadataLookupS32(NULL, recipe, "REMNANCE.THRESH");
 
+    // per-class normalization source (just a reference; don't free)
+    options->normClass = psMetadataLookupStr(NULL, recipe, "NORM.CLASS");
+
     return options;
 }