[en] Flavour changing radiative decays for strange and charmed hadrons are studied in a model where the GIM weak interaction triggers the flavour change at quark level and QCD corrections are taken into account. The amplitudes for photon emission are calculated for both non factorisable (negligible) and factorisable contributions (dominant). A 'modern pole model' is thereby achieved in which 56 and 70 intermediate states are included and the amplitude is normalised in terms of the fundamental quark weak interaction. Large parity violating amplitudes are generated and the relative size of all processes are explained qualitatively. A pattern of allowed (Λ→ n + γ) (is identically equal to ⁰→Σ⁰γ) and (is identically equal to ⁰→Λγ), suppressed (Σ⁺ p+γ) and doubly suppressed decays (Ω^- → and is identically equal to + γ) are found which show the complex pattern of symmetry and dynamical cancellations and enhancements. It is also shown that short distance effects are negligible. (author)