Creating HDR (High Dynamic Range) Images using multiple images (Craig)

So the basic idea is to use bracketed images of one scene to create an image that is similar to an HDR or high dynamic range image.  What you are essentially doing is masking specific portions of each layer to allow only select information about each image to come through.  You will be using a traditional bracketing technique and using specific parts of each image.  The tutorial I found is pretty detailed, which seems to be helpful.

Here is more detailed info about this process