A double exposure image is created by overlaying two images on one another. Follow a stepwise procedure:

1 Select all or a part of the image using the selection tools at the top of the toolbar.
2 Now from the edit menu choose copy.
3 Now open a second image file.
4 From the window menu, you can select the show layer.
5 On the ’show layer’ popup right click and choose new layer and press ok.
6 Now go to the edit menu and press paste.
7 From the layer’s palette, move the opacity slider to 50%.
8 Now drag the mouse from inside the selection to move it.
9 To scale the pasted selection, click on image menu and then select image size.

Adjust the size by adjusting the pixels and height from the pop-up window.