1. A scan bar for scanning a media sheet in an image scanning device, the scan bar comprising: a sensor arrangement comprising a first sensor region and a second sensor region; and a lens arrangement positioned to focus light reflected from the media sheet onto the sensor arrangement, wherein each of the first sensor region and the second sensor region generates image data corresponding to the media sheet from the focused light received from the lens arrangement, wherein image data generated by the first sensor region is of relatively higher resolution than image data generated by the second sensor region, and wherein the reflected light is focused onto at least one of the first sensor region and the second sensor region based upon a target image file size.