Raymond Campbell35 said:Basically, you just grab your head from one shot and slap it onto the other using free transform. If you really want to get fancy, you can actually strip the old head away entirely and fill in the background where it used to be. There are easy ways and hard ways to do that depending on how messy the background looks. If it's just a plain, solid color, you can just stretch it out... honestly, I can't quite explain the technicalities here, and I can't exactly give you a live demo on a forum. But if the background is complicated, you can play around with the Clone Stamp Tool and the Spot Healing Brush Tool...
Man, listen, first thing you gotta do is cut your head out of that other photo. Try to make sure the edges overlap slightly using either the
polygonal lasso tool or the
magnetic lasso tool(you'll find those in the side palette once you go to
window>tools), then move to the second photo.
Once you've got the head selected, hit
Select>inverse and then tap
delete. That should leave you with nothing but your head sitting on a white background. To make that white part transparent, you need to go to the layers palette—usually found at the bottom left if you click windows>layers
background —and double-click it to turn it into a regular layer. Then just select the white bits remaining on the photo, hit
delete, and boom, you have a transparent background.
Now you've just got the HEAD. Copy it (ctrl-A and ctrl+c) over to the target photo, and use
free transform (ctrl+T) to resize it until it actually fits the proportions of the new image.
To match the colors of the head to the rest of the photo, follow what Firestarter suggested, though
Image>Adjustement>Brightness/Contrast can definitely help a bit.
But honestly, it's hard to say exactly what you need without seeing it. Photoshop is an art form... or just playing around, depending on how you look at it.😁