When he passed away last year, Arnaud Darmont was finalizing the 2nd edition of is well-known book on HDR imaging.
The book is now available at SPIE: http://www.spie.org/Publications/Book/2512263
Arnaud was befriended with many of Caeleste. He was considered an expert in image sensor testing and image processing.
Posthumous book of Arnaud Darmont on HDR imaging