An imaging system, which may be applied both to black and white and color imaging systems and comprising a platen member which defines an imaging portion and a calibration portion is disclosed. The imaging portion and the calibration portion comprise separate portions of the platen member. The platen member is supported by a movably mounted support member, and moves with the support member between a platen member calibrating position and a platen member imaging position. The platen member is dimensioned to support a sheet to be imaged. An imaging module with an imaging zone is supported in a position where the imaging zone is positioned to coincide with a portion of a sheet supported on the imaging portion of the platen member, when the platen member is in the platen member imaging position. A calibration member having a reference reflectivity is adhered to the calibration portion of the platen member. The imaging zone coincides with the calibration member, when the platen member is in the calibrating position. The calibration member lies substantially outside the imaging zone of the imaging module, when the platen member is in the platen member imaging position. A motor moves the support member between the calibrating position and the imaging position to allow performance of a calibration procedure on the imaging module.