In one example, luminance information related to a digital raw image frame captured via a color filter array is obtained. Chrominance information related to the digital raw image frame is obtained. The obtained luminance information and chrominance information are downscaled to a target resolution, such that one of pixel data of the captured digital raw image frame and the obtained chrominance information has been demosaiced before the downscaling. The downscaled chrominance information is reverse-demosaiced.