I can say with confidence that I have a photographic memory. As for the question of whether I memorize the entire book, there are many additional factors.
There is a disease called "Hyperthymesia Syndrome", when a person exposed to it remembers absolutely every single detail, even after 25 years. The first and, so far, the last case officially registered is Jill Price, an American.
Since your question begs to be surprised, in view of the fact that, in your opinion, a person cannot remember so well, that's why I referred to this disease. This is such an ideal photographic memory.
My headman, also Masha, has a photographic memory. She really (!) Remembers all the text information at the meeting, remembers the arrangement of letters, words, sentences, excerpts. The whole group at first was terribly jealous of her, and then she told us that, of course, she could rewrite half of the history textbook from memory, but she does not remember the meanings. That is, in order for her to prepare, say, for an exam, she still reads all the notes, and not just looks through them and mentally "photographs". So now you will understand whether there are any advantages to this or not (probably, it still does, but she does not tell us).
I'm sure I have the most developed photographic memory. I will not say that whole books are straight, but individual bright moments are definitely remembered to the smallest detail: I know the page number of the cool moment, or that the ink is smeared there. That is, I remember exactly the appearance from where I remembered it. I even had to adapt it to the way I studied the material in preparation for exams.