1. Open an image.

2. Image > Adjustments > Desaturate

3. Make a duplicate of the desaturated layer.

Keep the duplicate later selected.

4. Image > Adjustments > Invert

5. Change the layer mode to "Color Dodge"

6. Filter > Blur > Gaussian Blur (Radius 4.9)

 

 

 

Then after this step find your controls for

Brightness and contrast and tweak away

 till youi have something that you can work with.

Then you will have to clean up with a paint brush

 to get rid of any floaters