How to make it without Freeform by Digieffects…?

[Duca Simone luchini]

Hi Ted,
I tried to make surfer displacement map in Photoshop but I can’t make something as you’ve done. I duplicated surfer selection and applied Hue (Saturation effect to make selection in grey scale. But you displacement map was something like a Z depth maps… and not a B&W image. I really ask help ti make the same mask as you have done in your tut. Many thanks!