Index: /trunk/ippTools/src/difftool.c
===================================================================
--- /trunk/ippTools/src/difftool.c	(revision 29168)
+++ /trunk/ippTools/src/difftool.c	(revision 29169)
@@ -1645,5 +1645,6 @@
     PXOPT_COPY_F32(config->args,   selectWhere, "-sun_angle_min",      "inputRawExp.sun_angle",      ">=");
     PXOPT_COPY_F32(config->args,   selectWhere, "-sun_angle_max",      "inputRawExp.sun_angle",      "<");
-    PXOPT_COPY_STR(config->args,   selectWhere, "-comment",            "inputRawExp.comment",        "LIKE");
+    PXOPT_COPY_STR(config->args,   selectWhere, "-input_comment",      "inputRawExp.comment",        "LIKE");
+    PXOPT_COPY_STR(config->args,   selectWhere, "-template_comment",   "templateRawExp.comment",     "LIKE");
 
     // Haversine formula for great circle distance
@@ -1676,4 +1677,5 @@
 
     PXOPT_LOOKUP_BOOL(simple, config->args, "-simple", false);
+    PXOPT_LOOKUP_U64(limit, config->args, "-limit", false, false);
     PXOPT_LOOKUP_BOOL(pretend, config->args, "-pretend", false);
 
@@ -1835,4 +1837,7 @@
     long numGood = 0;                   // Number of good rows added
     for (long i = 0; i < results->n; i++) {
+        if (limit && numGood >= limit) {
+            break;
+        }
         psMetadata *row = results->data[i]; // Result row from query
 
Index: /trunk/ippTools/src/difftoolConfig.c
===================================================================
--- /trunk/ippTools/src/difftoolConfig.c	(revision 29168)
+++ /trunk/ippTools/src/difftoolConfig.c	(revision 29169)
@@ -291,7 +291,9 @@
     psMetadataAddF64(definewarpwarpArgs,  PS_LIST_TAIL, "-posang_min",         0, "search by min rotator position angle", NAN);
     psMetadataAddF64(definewarpwarpArgs,  PS_LIST_TAIL, "-posang_max",         0, "search by max rotator position angle", NAN);
-    psMetadataAddF32(definewarpwarpArgs,  PS_LIST_TAIL, "-sun_angle_min",         0, "search by min solar angle", NAN);
-    psMetadataAddF32(definewarpwarpArgs,  PS_LIST_TAIL, "-sun_angle_max",         0, "search by max solar angle", NAN);
-    psMetadataAddStr(definewarpwarpArgs,  PS_LIST_TAIL, "-comment",            0, "search by comment field (LIKE comparison)", NULL);
+    psMetadataAddF32(definewarpwarpArgs,  PS_LIST_TAIL, "-sun_angle_min",      0, "search by min solar angle", NAN);
+    psMetadataAddF32(definewarpwarpArgs,  PS_LIST_TAIL, "-sun_angle_max",      0, "search by max solar angle", NAN);
+    psMetadataAddStr(definewarpwarpArgs,  PS_LIST_TAIL, "-input_comment",      0, "search by comment field for input exposure(LIKE comparison)", NULL);
+    psMetadataAddStr(definewarpwarpArgs,  PS_LIST_TAIL, "-template_comment",   0, "search by comment field for template exposure(LIKE comparison)", NULL);
+    psMetadataAddU64(definewarpwarpArgs, PS_LIST_TAIL, "-limit",  0,            "limit result set to N items", 0);
 
     // -definestackstack