You need software that will reduce opacity 50%. Then you need two images that are the same size. Then you flip one 180 degrees and also horizontal, reduce the opacity and make a layer over the other normal image. Make a duplicate, then repeat the process for the opposite side. I try to get new coin images from the U.S. Mint site and older coin images from HeritageCoin.com because they have large images and I reduce them in size to suit my needs.