add alpha slider for rgb pad
Created by: MartinHN
Again , just a bit of code I needed, sharing, but not imposing, I'm certain it can be done in a cleaner way (we don't need to recompute hsv if alpha change...)
Created by: MartinHN
Again , just a bit of code I needed, sharing, but not imposing, I'm certain it can be done in a cleaner way (we don't need to recompute hsv if alpha change...)