In the context of the General Relativity Theory, gravitational corrections to the thermodynamics of electromagnetic radiation close to Schwarzschild surface are considered. In particular, we discuss the notion of photon by using particle description as an approach to the statistical thermodynamics of the fields, since characteristic wavelenghts are small compared to other relevant lenght-scales in the regions of interest to us. As an application of the results obtained we present a review of Einstein’s paper On a Heuristic Point of View Concerning the Emission and Transformation of Light. Finally, among other thermodynamic properties, we show that the entropy considered in this paper is consistent with the holographic principle.