1. An imaging sensor for low light level color imaging, comprising: an array of pixels, each of the pixels comprising: a first pixel portion that has a first photosensitive area and is responsive to light in a panchromatic spectral range; and a second pixel portion that has a second photosensitive area and is responsive to light in a sub-band spectral range, the first photosensitive area being greater than the second photosensitive area and the sub-band spectral range being narrower than and contained within the panchromatic spectral range, wherein the first pixel portion and the second pixel portion of each pixel are independently addressable.