This is the answer to this question: I am taking a picture of a head and moving it onto the body on a different picture. When I drag the head to the other picture it shows up as a layer but is way too big for the body. How do I shrink the size of the head so it will look normal on the body?
There are lots of ways to do this. I find that this is the easiest way for me:
Begin by opening both Photoshop images and placing them side by side. It's best to view them at the same resolution, but it really doesn't matter, when you drag a part of one image into another, it shows in the resolution of the target image, which can sometimes be a surprise. Don't worry about that. The goal in this example is to get the giant head of me as a kid onto me as a grownup.
personal on-site software training in Adobe Photoshop, Illustrator or Dreamweaver in the greater Phoenix, Arizona area, please contact me.