Say I want to create a glowing button for a website. I would like to have the possibility to dynamically change the color of that button by changing the color of it's background.
For this I need to create some kind of transparent layer from my original image that i will then superimpose over a colored background.
Imagine I create a round button with an external glow such as this one :
The image I need to create from the image above is the one below :
By superimposing this transparent layer over a colored background, I could "re-create" the first image, but with the color of the background.
Is there a way I can create the second image from the first one using Photoshop CS4?