1. A circuit, comprising: an image sensor including a plurality of pixels; a line selection circuit configured to make line selections of pixels in the image sensor in response to a line selection control signal; an image control circuit configured to output an image control signal; an ambient control circuit configured to output an ambient control signal; and a multiplexer having a first input for receiving the image control signal and a second input for receiving the ambient control signal, said multiplexer operable to select one of said image control signal and ambient control signal for application as the line selection control signal to said line selection circuit.