Duplicate the background current layer (Layer> Duplicate Layer) and change the blending mode of the new layer to Screen. {mosimage}
Apply a Find Edges filter (Filter> Stylize> Find Edges). {mosimage}
Invert the current layer (Image> Adjustments> Invert or Ctrl+I). {mosimage}
Colorize
Add a new Hue/Saturation adjustment layer (Layer> New Adjustment Layer> Hue/Saturation). For this step, I will use these settings: Colorize: Checked Hue: 100 Saturation: 100 {mostip image=tipon}This step is optional and may be skipped if you do not want to colorize the image. {/mostip} {mosimage}