diff --git a/src/bin/inspect.c b/src/bin/inspect.c
index 6b8484c..670144f 100644
--- a/src/bin/inspect.c
+++ b/src/bin/inspect.c
@@ -1362,6 +1362,7 @@ main(int argc, char *argv[])
                        goto end;
                     }
                   ex_unit->imgs = eina_list_append(ex_unit->imgs, ex_img);
+                  ex_unit->nb_shots++;
                   _units = eina_list_append(_units, ex_unit);
                }
           }
@@ -1437,9 +1438,10 @@ main(int argc, char *argv[])
 
    if (compare_files && output)
      {
-        Exactness_Unit *unit1 = NULL, *unit2 = NULL;
-        Eina_List *itr;
-        EINA_LIST_FOREACH(_units, itr, unit)
+        const char *out_ext = strrchr(output, '.');
+        Exactness_Unit *unit1 = NULL, *unit2 = NULL, *unitO = NULL;
+        Eina_List *itr1, *itr2;
+        EINA_LIST_FOREACH(_units, itr1, unit)
           {
              if (!unit1) unit1 = unit;
              else if (!unit2) unit2 = unit;
@@ -1450,16 +1452,39 @@ main(int argc, char *argv[])
                }
           }
 
-        if (!strcmp(ext, ".png"))
+        if (!strcmp(out_ext, ".png"))
           {
-             Exactness_Image *ex_img1 = eina_list_data_get(unit1->imgs);
-             Exactness_Image *ex_img2 = eina_list_data_get(unit2->imgs);
-             Exactness_Image *ex_imgO = NULL;
+             if (unit1->nb_shots != 1 || unit2->nb_shots != 1)
+               {
+                  fprintf(stderr, "Comparison output can be png only if the number of shots to compare is 1.\n");
+                  goto end;
+               }
+          }
 
+        itr1 = unit1 ? unit1->imgs : NULL;
+        itr2 = unit2 ? unit2->imgs : NULL;
+
+        while (itr1 || itr2)
+          {
+             Exactness_Image *ex_img1 = itr1 ? eina_list_data_get(itr1) : NULL;
+             Exactness_Image *ex_img2 = itr2 ? eina_list_data_get(itr2) : NULL;
+             Exactness_Image *ex_imgO = NULL;
              if (exactness_image_compare(ex_img1, ex_img2, &ex_imgO))
                {
-                  Ecore_Evas *ee;
-                  Eo *e, *img;
+                  if (!unitO) unitO = calloc(1, sizeof(*unitO));
+                  unitO->imgs = eina_list_append(unitO->imgs, ex_imgO);
+                  unitO->nb_shots++;
+               }
+             itr1 = eina_list_next(itr1);
+             itr2 = eina_list_next(itr2);
+          }
+        if (!strcmp(out_ext, ".png"))
+          {
+             Ecore_Evas *ee;
+             Eo *e, *img;
+             if (unitO->nb_shots == 1)
+               {
+                  Exactness_Image *ex_imgO = eina_list_data_get(unitO->imgs);
                   ee = ecore_evas_new(NULL, 0, 0, 100, 100, NULL);
                   e = ecore_evas_get(ee);
                   img = evas_object_image_add(e);
@@ -1469,7 +1494,18 @@ main(int argc, char *argv[])
                   ecore_evas_free(ee);
                   goto end;
                }
+             ret = 0;
           }
+        else if (!strcmp(out_ext, ".exu"))
+          {
+             if (unitO) exactness_unit_file_write(unitO, output);
+             else ret = 0;
+          }
+        else
+          {
+             fprintf(stderr, "Correct output extension (.exu/.png) required\n");
+          }
+        goto end;
      }
 
    ret = 0;