What I find new about photoreading is only the photo reading step. The other steps of photo reading are almost (more than 95%) same to speed reading.By learning speed reading , one can easily learn photoreading because previewing, postviewing, super reading and rapid reading all requires the skills of speed reading.So it can be concluded that :- speed reading+ mental photography= photoreading.
But speed reading is more believable than others because by my own experiences , I have found increased comprehension and speed in reading by the speed reading techniques (mainly meta-guiding techniques) but for mental photography , I don't know what to say because I can't find any benefits but still I believe that mental photography works , if not today , it will tomorrow.