The invention relates to an optical filtering structure consisting of a set of at least two elementary optical filters (R, V, B), an elementary optical filter being centered on an optimum transmission frequency, characterized in that it comprises a stack of n metal layers (m1, m2, m3) and n substantially transparent layers (d1, d2, d3) which alternate between a first metal layer (m1) and an nth substantially transparent layer (d3), the n metal layers (m1, m2, m3) each having a constant thickness and at least one substantially transparent layer having a variable thickness which sets the optimum transmission frequency of an elementary optical filter, n being an integer larger than or equal to 2.Application to miniature image sensors.