STEP 3
Now again duplicate your “layer 1” by pressing Ctrl+J/Cmd+J or by going to Layer>Duplicate Layer. In this step we are going to invert the colors of our image. Go to Image>Adjustment>Invert or you can press Ctrl+I/Cmd+I as keyboard shortcut.
Change the blend mode of “layer 1 copy” to Color Dodge.
I have written a whole tutorial on Blending Modes in Photoshop and you should check that tutorial out if you are not aware of the power of Blending Modes.
After hanging the blend mode your image will turn to white color. Don’t worry it is temporary.