Png with opaque glow
Hi i am rendering some 3d imagery from cinema 4d. I have light in my scene and i need to be able to create layers over the top in oder to change the colour on-the fly.
I have this type of image:
I want to change it to something like this by clicking on a layer in Photoshop The arrows show the area i am interested in.

I think I need something like this to do the job.

Can any wise members tell me how I might acomplish this. I can use a pen tool to create the shapes but I'm not sure what type of fill to give it.
Any help would be most appreciated.
