To allow much better user control of how a camera output image captures an original scene, the imaging camera unit (401), arranged to form part of a image-capturing camera system (400), includes a user-interface (420), allowing a user to specify at least one indication (gp) of a geometric position of an object (101) of his preference in a captured image (Io) received from an imaging sensor (406) via an input (403), a user-adaptable object segmentation unit (410), arranged to determine a set of pixels (sg) being part of the object (101), on the basis of the indication (gp), and a color composition monitor unit (412), arranged to determine at least one statistic (ST) on the basis of at least one color property of pixels in the set of pixels (sg).