This video tutorial by photoshopuniverse teaches you how to blend two images seamlessly using Photoshop. For this you need two or more images that need to be blended together. Using the move tool in Photoshop move one image over to the other image. Open the layers window and make a layer mask as shown and select the gradient tool making sure the colors are white on black and connect the two images as shown. Using the brush and the opacity at 50% reveal the parts of the image that need to be clear as demonstrated.