some minor additional discussion in o-b.org

org-babel.org

@@ -366,10 +366,13 @@ This is listed under [[* graphical output][graphical output]] in out objectives.
 
 This should take advantage of the =:results file= option, and
 languages which almost always produce graphical output should set
-=:results file= to true by default.  That would handle placing these
-results in the buffer.  Then if there is a combination of =silent= and
-=file= =:results= headers we could drop the results to a temp buffer
-and pop open that buffer...
+=:results file= to true by default (this is currently done for the
+gnuplot and ditaa languages).  That would handle placing these results
+in the buffer.  Then if there is a combination of =silent= and =file=
+=:results= headers we could drop the results to a temp buffer and pop
+open that buffer...
+
+Display of file results is addressed in the [[* =\C-c \C-o= to open results of source block][open-results-task]].
 
 *** TODO R graphics to screen means session evaluation
     If R graphical output is going to screen then evaluation must be