Pulling a background with Apply Image

In this exercise we are going to take our finished mask which we are currently…seeing on screen and we are going to use it to composite the light-haired woman…against a new background.…I also have opened this image called Valley of Fire.jpg and we are going to go…ahead and mask the image and introduce a new background blind.…So we are going to essentially work the most efficient way possible.…I just want you to see what that looks like and we are going to be taking…advantage of the Apply Image command as well.…So your first thing is to make sure that your final mask is the first alpha…channel in the list so that it has a keyboard shortcut of Ctrl+6 or Command+6…on the Mac, and notice whichever alpha channel is on top, ends up getting that keyboard shortcut.…

So if I just grab final mask, move it directly below blue, it's automatically…Ctrl+6, again, Command+6 on the Mac.…Now let's switch to the RGB image, and I will switch over to layers panel.…We will not need to go back to the Channels panel now, because we are going to…