  Direct photon production is an important process at hadron colliders, being
relevant both for precision measurement of the gluon density, and as background
to Higgs and other new physics searches. Here we explore the implications of
recently derived results for high energy resummation of direct photon
production for the interpretation of measurements at the Tevatron and the LHC.
The effects of resummation are compared to various sources of theoretical
uncertainties like PDFs and scale variations. We show how the high--energy
resummation procedure stabilizes the logarithmic enhancement of the cross
section at high--energy which is present at any fixed order in the perturbative
expansion starting at NNLO. The effects of high--energy resummation are found
to be negligible at Tevatron, while they enhance the cross section by a few
percent for $p_T \lsim 10$ GeV at the LHC. Our results imply that the
discrepancy at small $p_T$ between fixed order NLO and Tevatron data cannot be
explained by unresummed high--energy contributions.
