An integrated circuit (IC) includes a photosensor array, some cells of
which are reference cells that photosense throughout an application's
energy range, while other cells of which are subrange cells that
photosense within respective subranges. For example, the subrange cells
can receive photons in their respective subranges from a transmission
structure that has laterally varying properties, such as due to varying
optical thickness. The reference cells may be uncoated or may also
receive photons through a transmission structure such as a gray filter.
Subrange cells and reference cells may be paired in adjacent lines across
the array, such as rows. Where photon emanation can vary along a path,
quantities of incident photons photosensed by subrange cells along the
path can be adjusted based on quantities photosensed by their paired
reference cells, such as with normalization.