Does anyone know how to take a person from a photo and place them beside someone else in another photo and have it look real? (eg: putting a pic of myself beside Robocop so it looks as if we are talking)
Cut and paste using one of the lasso tools, try to match the DPI of each image, feather the edge about 5 pixels or so. Here is another option http://photoshopcontest.com/tutorials/2/cut-and-paste-options.html