In this Quick Tip, Julieanne quickly demonstrates how to create a 32-bit file from multiple exposures in Photoshop and then, using the Develop module in Lightroom 4.1 refines the image's color and tonality both globally and selectively - all while still working in 32-bit! In the tutorial, I don’t believe that I mentioned that when I choose Edit > In, my default setting is to hand off a TIFF file to Photoshop. That way, when I save the file, it saves a 32-bit TIFF – which is what Lightroom prefers (not a PSD file).

This new effect gives you the ability to create the optical effect of a real camera lens blur. If you need to add depth to a scene, or obscure something in the frame, Camera Lens Blur will do that and make it look completely realistic. You also have complete control parameters like iris shape, blur maps, super whites, gain and threshold.

Colors are represented as red, green, and blue channels, and there's an additional channel that defines transparency – the alpha channel. In this video, you'll see how to control how you view the information about these channels.