The titanate and zirconate couplers may include tetraalkoxy titanates [Ti(OR)4] and tetraalkoxy zirconates [Zr(OR)4], where R is alkyl, such as methyl, ethyl, propyl, isopropyl, n-butyl, or t-butyl, and organic titanates [RnTiR???(4-n)] and organic zirconates [RnZrR???(4-n)].