  We describe the calculation of the next-to-next-to-leading order (NNLO) QCD
corrections to isolated photon and photon-plus-jet production, and discuss how
the experimental hadron-level photon definition and isolation criteria can be
approximated in the theoretical parton-level calculation. The NNLO corrections
lead to a considerable reduction of the theory uncertainty on the predictions,
typically to less than five per cent, and enable an improved description of
experimental measurements from ATLAS and CMS.
