Giving a raw image, use the matlab functions: colon operator, cat, subplot to

1. extract 4 quarter-resolution images from the image, by extracting every other pixel. e.g., if the raw image uses bggr, img(1:2:end, 1:2:end) would be the blue channel (how would the red component be extracted?)

2. create 4 RGB images, one per Bayer mosaic candidate; an RGB image can be created from 3 1-channel images using cat; hint: given a Bayer candidate, which subimage Represents red? (draw a 2x2 box)

3. show the 4 RGB images resulting from each potential Bayer mosaic, labeled by their mosaic 4-tuple (e.g., bggr), in a 2x2 grid; brighten each image by scaling by 5.