There are many ways of extending an image in ways that don’t appear obvious. We do this a lot, particularly when there is not enough image to use as a wraparound the frame. If there is enough image the client needs to indicate the parameters of the picture that must appear on the front of the picture beyond that edge we use to wrap around the wooden frame. When we need to add extra to give a wrap around the following options are often done.
This extended area for the side of the frame in the pic below was artificially created.
The extended area for the side of the frame in the pic below was made by adding a plain colour.
Posted by Paul (Snr) - Image prpeperation at PrintWild