  In this work, we study the optical properties of a class of magnetically
charged rotating black hole spacetimes. The black holes in question are assumed
to be immersed in the quintessence field, and subsequently, the resulting black
hole shadows are expected to be modified by the presence of the dark energy. We
investigate the photon region and the black hole shadow, and in particular,
their dependence on the relevant physical conditions such as the state
parameter of the quintessence, the angular momentum, and the magnitude of the
magnetic charge. It is shown that the photon regions sensitively depend on the
horizon structure and possess intricate features. Moreover, from the viewpoint
of a static observer, we explore a few observables, especially those associated
with the distortion of the observed black hole shadows.
