Instructables
Here is a relatively easy way to to take a photo of yourself or someone else and make it look like two faces in one. I always loved the candlestick illusion. This is my version of it.
Link to candlestick if you haven't seen it before.
http://www.blogcdn.com/www.switched.com/media/2008/09/facevase.jpg



Tools Needed.
Photoshop or some photo editing software.
A front and side view photo of target.
It takes about 20 to 45 min to make.
 
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Step 1:

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Take two photos one facing the camera (image 1)
and one facing 90° from the camera. (image 2)
Open both photos into one Photoshop file. (image 3)
With the side view layer selected use the quick selection tool to clear the back ground. (image 4)
Use the transform tool to adjust the size of the heads to match. (image 5)
I made the side head a little bigger.
Line up the noses and mouths. (image 6)
Press and hold "Ctrl" and click the side view layer. It should put a dotted line around the side view head. (image 6)
Select the front veiw layer and press the mask button.
Turn off the side view layer. (image 7)
Should look like image 8.
Adjust the mask by using the paint bush with black(to add to the mask) or white (to remove from the mask).
The final mask should look like image 9.

I made 2 versions of this image.
Version 1 is easier, faster, and doesn't make changes to the image. It uses shadows to change the eye. (go to step 2)
Version 2 changes the eye of the front view to the side view. (go to step 3)

Step 2: Version 1

Version 1: Uses the burn tool and shadows to make the face appear to look both ways.

To add shadow: Image > adjustment > levels. Move the blacks to the right to add more shadow. (image 1)
Use burn tool on left side of eye to add even more shadow. (image 2)
Jump to step 4 now.
I think it would've worked a lot better if you didn't have two nostrils on one side of your nose :P
ZDress3 years ago
Whoa! Took me a while to catch what was going on, then once i've figured it out, I have to admit. I'm impressed!

Kudos.
Barb37 ZDress1 year ago
Ditto! I was lost, and it took a little time and effort to find my way. Once I did - WOW! The double nostril is what did it for me - VERY clever!
coaleu (author)  ZDress3 years ago
Thanks a lot. I am glad I impressed you!
BHAVIK JAIN2 years ago
can u do just 1 thing. can u makes a video of Creepy Double Face Illusion all detail. from start to finish and upload it.
Hola, soy Jesús González. Y la cosa tampoco es tan complicada. En Ningun momento recorto la imagen, pero está bueno el intento :)
coaleu (author)  jrodríguez522 years ago
Hey i really dont speak Spanish. it is a really easy trick. glad you liked it
rimar20003 years ago
Cool!
coaleu (author)  rimar20003 years ago
gracias.
mikeasaurus3 years ago
I did a double-take, creepy!
coaleu (author)  mikeasaurus3 years ago
Thanks for the comment!