1. An imaging system for electronically capturing optical images comprising: a pixel array including, a first pixel group associated with a first portion of an optical image and a first signal, the first pixel group including color components of at least three different colors, and a second pixel group associated with a second portion of the optical image and a second signal, the second pixel group including color components of at least the three different colors; a digital conversion system including, a first digital conversion subsystem, including a first level shift function configured to receive the first signal, a first black offset function, a first gain function and a first analog to digital converter configured to convert the first signal to a first digital signal, and a second digital conversion subsystem, including a second level shift function configured to receive the second signal, a second black offset function, a second gain function and a second analog to digital converter configured to convert the second signal to a second digital signal, wherein each of the first and second digital conversion subsystems are configured to operate in a first or second power mode, the first power mode consuming more power than the second power mode.