I was to superimpose two atom cloud images in Mathematica, with one cloud image centered on the other one. I have tried looking at other threads on this topic but haven't been able to get their solutions to work. I attached the two images to this post. The main issue is that I can't get rid of the white background when I try to overlay the image. Changing the opacity doesn't seem to help either. Ideally I would be able to overlay the images and adjust the transparancy of one relative to the other.
Note: In the final image, one of the clouds will need to be larger than the other by some factor that is ideally variable