Instructables user hackbp has written a tutorial which shows you how to transmit an image over radio waves. He uses a method known as SSTV Martin 2 to convert an image into ‘lines’ which are then sent in binary form over the airwaves. It’s the same method used by high altitude balloons to transmit their images back to Earth. I do note, however, that he hasn’t dealt with receiving the data and reconstituting the images at the other end, which is a shame, but the tutorial might be useful to get you started. Read more here.