The shadows of black holes encode significant information about the
properties of black holes and the spacetime surrounding them. So far, the
effects of dispersive media, such as plasma, and relativistic aberration on the
propagation of light around compact objects have been treated separately in the
literature. In this paper, we will employ the Konoplya, Stuchlik, and Zhidenko
family of stationary, axially symmetric, and asymptotically flat metrics to
describe the spacetime around rotating black holes. We will study how the
parameters of the black hole, the chromatic effects resulting from the presence
of a non-magnetized, pressureless plasma environment, and the effects of
relativistic aberration of a moving observer modify the morphology of the
shadow.Comment: Several improvements, new graphics, and discussions. Accepted in PR