The triple gauge boson couplings between two W bosons and a photon have been studied using photonic events with missing energy. The data sample was recorded with the OPAL detector at LEP and has an integrated luminosity of 601 pb^-1 with centre-of-mass energies ranging from 189 to 207 GeV. The 95% confidence intervals for the parameters Delta_kappa_gamma and lambda_gamma have been determined to be Delta_kappa_gamma$ = [-0.5, 2.2], lambda_gamma = [-1.8,2.3] from the differential cross section in the photon energy, E_gamma , and polar angle, cos(theta_gamma).