making an image 3D

first take the image you want to make 3D and upload it to photoshop. Ans create another layer.

then go to image,adjustments,levels and change the channel to red and the output levels to 0.

on the background layer do the same but change it to green and then again to blue.

after uve done the above selete the bar above your layers and change it to screen 'make sure your on the background copy'

then selete the move tool and drag the image down and to the left a little.

the final image will look 3D

i also did this with a black and white image and an image with text in.