Returns True when successful; returns False if NULL _i_m_a_g_e,
NULL _i_m_a_g_e__n_a_m_e, or duplicate _i_m_a_g_e__n_a_m_e is used as a
parameter value.
RRRREEEELLLLAAAATTTTEEEEDDDD
XXXXmmmmUUUUnnnniiiinnnnssssttttaaaallllllllIIIImmmmaaaaggggeeee(3), XXXXmmmmGGGGeeeettttPPPPiiiixxxxmmmmaaaapppp(3), and XXXXmmmmDDDDeeeessssttttrrrrooooyyyyPPPPiiiixxxxmmmmaaaapppp(3).