A common workflow in digital photography involves viewing
high resolution images on LCD displays - either computer
monitors or camera viewfinders. To minimise cost and
complexity, most cameras use a single sensor overlaid with a
Bayer filter to selectively sample various wavelengths at interleaved
locations. Missing data must then be interpolated,
which is known to introduce artefacts. In order to show the
image on a display with a lower resolution, it must then be
downsampled, which introduces more artefacts. This process
usually does not take into account the fact that LCD
displays are composed of horizontally displaced subpixels,
which can be individually addressed to achieve a higher effective
horizontal resolution. A new downsampling algorithm
is proposed, which works directly within the Bayer
domain and exploits subpixel resolution to produce images
of higher detail than the na¨ıve demosaicking and downsampling
combination.