  Theoretical scaling relations for solar-like oscillators and red giants are
widely used to estimate fundamental stellar parameters. The accuracy and
precision of these relations have often been questioned in the literature, with
studies often utilising binarity for model-independent validation. However, it
has not been tested if the photometric effects of binarity introduce a
systematic effect on the extraction of the seismic properties of the pulsating
component(s). In this paper, we present an estimation of the impact of a
contaminating photometric signal with a distinct background profile on the
global asteroseismic parameter $\nu_{\text{max}}$ through the analysis of
synthetic red-giant binary light curves. We generate the pulsational and
granulation parameters for single red giants with different masses, radii and
effective temperatures from theoretical scaling relations and use them to
simulate single red-giant light curves with the characteristics of Kepler
long-cadence photometric data. These are subsequently blended together
according to their light ratio to generate binary red-giant light curves of
various configurations. We then perform a differential analysis to characterise
the systematic effects of binarity on the extraction of $\nu_{\text{max}}$. We
find that the $\nu_{\text{max}}$ extraction for red-giant power spectra
featuring overlapping power excesses is unreliable if unconstrained priors are
used. Outside of this scenario, we obtain results that are nearly identical to
single-star case. We conclude that i) the photometric effects of binarity on
the extraction of $\nu_{\text{max}}$ are largely negligible as long as the
power excesses of the individual components do not overlap, and that ii) there
is minimal advantage to using more than two super-Lorentzian components to
model the granulation signal of a binary red-giant.
