1. A CMOS imager comprising: a plurality of pixels arranged in columns and rows, wherein each of the pixels includes: a photodetector; a color filter portion; and a microlens; and a communications bus to selectively read out image data from the plurality of pixels, wherein the plurality of pixels includes at least a first set of pixels, with the first set of pixels having physical properties so as to introduce a hidden or concealed digital watermark component to image data during image capture by the CMOS imager, wherein each of the plurality of pixels communicates with different amplifiers, and wherein the physical properties comprise varied gain of different amplifiers associated with the first set of pixels.