  The intensity and energy spatial distributions of collimated laser Compton
scattering (LCS) $\gamma$-ray beams and of the associated bremsstrahlung beams
have been investigated as functions of the electron beam energy, electron beam
phase space distribution, laser optics conditions and laser polarization. We
show that the beam halo is affected to different extents by variations in the
above listed parameters. In the present work, we have used laser Compton
scattering simulations performed with the \texttt{eliLaBr} code
(https://github.com/dan-mihai-filipescu/eliLaBr) and real LCS and
bremsstrahlung $\gamma$-ray beams produced at the NewSUBARU synchrotron
radiation facility. A 500~$\mu$m MiniPIX X-ray camera was used as beamspot
monitor in a wide $\gamma$-ray beam energy range between 1.73~MeV and 38.1~MeV.
