The ultimate goal of constructing an autostereoscopic display is to reproduce exact light fields of 3D scenes on the display’s surface. However, most existing autostereoscopic displays can only reproduce inexact light fields. Filling the gap between them has been a major target of research. In this paper, we present a light field modulator consisting of a liquid crystal panel, a light diffuser, and a pair of lenticular sheets. The modulator will modify the intensity of light passing through it. When combined with a color filter, the modulator can also modify the color tone. Since the modification depends on the light’s propagation direction, the modulator can be tuned to improve the quality of the light field from being inexact to being nearly exact. To further investigate the modulator’s capability, we put it in front of a multilayer display. The light fields reproduced by a multilayer display are only approximate especially when the display is tailored to cover a wide viewing zone. We observe that the modulator can mitigate the occurrence of artifacts in the outputted light fields. We also observe that monochromatic fields can be converted into color fields using the modulator.