Index: trunk/tools/mask_extra.c
===================================================================
--- trunk/tools/mask_extra.c	(revision 20603)
+++ trunk/tools/mask_extra.c	(revision 20604)
@@ -89,6 +89,7 @@
     psFree(desc);
 
+    long numPix = numCols * numRows;    // Number of pixels
     for (int i = 0; i <= maxType; i++) {
-        printf("Type %d: %d\n", i, count->data.S32[i]);
+        printf("Type %d: %d (%f%%)\n", i, count->data.S32[i], count->data.S32[i] / (float)numPix * 100.0);
     }