Downloadable in PDF format.

Royce Howland has written a fine HDR tutorial for the July 2006 Naturscapes.net site which takes the reader through the process far more systematically than my amateur ramblings on the subject. There’s an instructive comparison of Photomatix with Photoshop and some wise words on how overdoing things can easily lead to ‘cartoonish’ (in Howland’s words) results.

Recommended reading.