1. An image sensor pixel, comprising: a photo-sensitive element formed in a substrate, wherein the photo-sensitive element is configured to convert light into electric charge; lensing structures having a transmissive central region, surrounding opaque edge regions, and a transition region between the center and edge regions in which the lensing structures gradually transition from being transmissive to being opaque such that the lensing structures are configured to pass a first portion of the light that is incident on the central region of the lensing structures onto the photo-sensitive element, to reject a second portion of the light that is incident on the surrounding edge regions of the lensing structures, and to partially pass and partially reject a third portion of the light that is incident on the transition region.