I've just developed this technique over the last several months. I love bouncing my on-camera flash off a wall or any other surface. I want those photons coming in from a decent direction to give me that beautiful direction of light I want on my images.
There are many times, though, when the surface the light is bounced from is not perfectly neutral thereby color shifting the light just a bit. Sure, it a fairly easy Photoshop fix, but I wanted to get it closer or correct in the camera. Watch the short video below to see how I solved my problem. Enjoy, -David