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Open Photoshop. Open both photos in Photoshop. Click the tab for the photo of you. Open the Quick Selection tool. Select your outline. Subtract any extra edges. Open the "Refine Edge" menu. Remove any jagged edges. Copy the selection. Paste the selection into the famous person's photo. Adjust the image's size and position. Save your completed project.
This process will vary depending on the computer you're using:   Windows — Click Start {"smallUrl":"https:\/\/www.wikihow.com\/images\/0\/07\/Windowsstart.png","bigUrl":"\/images\/thumb\/0\/07\/Windowsstart.png\/30px-Windowsstart.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Windows icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Public_domain\">Public Domain<\/a><br>\n<\/p><\/div>"}, type in photoshop, and click Photoshop at the top of the menu.  Mac — Click Spotlight {"smallUrl":"https:\/\/www.wikihow.com\/images\/e\/ea\/Macspotlight.png","bigUrl":"\/images\/thumb\/e\/ea\/Macspotlight.png\/30px-Macspotlight.png","smallWidth":460,"smallHeight":460,"bigWidth":"30","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Mac icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Fair_use\">Fair Use<\/a><br>\n<\/p><\/div>"}, type in photoshop, and double-click Photoshop at the top of the results. You'll need both your celebrity photo and your personal photo in Photoshop as separate files:  Click File  Click Open...  Hold down Ctrl (Windows) or ⌘ Command (Mac) while clicking both your celebrity image and your personal image. Click Open  Follow any on-screen prompts. It should be at the top of Photoshop. Doing so will bring up your photo in the main Photoshop window. Click the paintbrush-shaped Quick Selection tool icon in the left-hand toolbar, then click the square New Selection icon in the options bar. If you don't see the Quick Selection tool, click and hold the Magic Wand selection tool (which resembles a wand with a star on it) until Quick Selection appears next to it. Click inside of your picture until the whole picture is selected. You may need to zoom in on the picture to select some of the finer details (e.g., pieces of hair). Click the Subtract icon, which resembles white and black overlapping squares, then click any parts of the selection which stray outside of the section you want to copy. For example, if Photoshop selected a section of the background behind you, you'd click that part of the selection to remove it and contain the selection to your outline. Click Select at the top of the Photoshop window (or, on a Mac, at the top of the screen), then hold down ⇧ Shift while clicking Select and Mask... in the drop-down menu. Click and drag the "Refine" brush across any sections of the selection which look jagged or unnatural, then click OK when you're done. You'll notice this most with hair and pieces of clothing. Click Edit, then click Copy in the resulting drop-down menu. You can also press Ctrl+C (Windows) or ⌘ Command+C (Mac). Click the tab for the photo of the celebrity, then click Edit and click Paste in the resulting drop-down menu. You should see the copied outline appear in the celebrity's photo. You can also press Ctrl+V (Windows) or ⌘ Command+V (Mac) to do this. Click Image, click Free Transform in the drop-down menu, and then adjust the following attributes of the image:   Position — Click and drag the center of the image to your preferred spot.  Size — Click and drag one of the corners of the image inward to shrink it or outward to enlarge it. Once you're satisfied with your photo's appearance, you can save it as a cohesive image on your computer:  Click File  Click Save As...  Enter a file name. Select a save location. Select a format (e.g., JPG for a photo). Click Save.