Just thought I'd mention this.
As you might know, photobook bindings can actually be quite fragile things.
The first thing I do when I get a new book is to open it gently from the front. Depending on how stiff the binding is you might not want to open it all the way. Then I go through the entire book taking a bunch of pages at at time—five, ten, or 20 depending on the size of the book and the feel of the binding. I open the book at each point and gently press open the binding—not hard enough to stress or crack it and often not as wide as you will eventually want to open it when reading or looking at the book, but enough to flex it and get it to start to relax. This helps keep the binding from "cracking" at some later point.
When taking the pages in bunches, it's preferable to open them in between signatures rather than at signature breaks (the book tends to want to fall open at signature breaks so just part the pages where they seem to want to stay together).
Then I turn the book upside-down and go through it again from the back, doing the same thing again. This helps keep the binding square and prevents it from getting cocked.
When you go through only part of a photobook, you might want to open it in a few places in the part of the text block you didn't go through. The binding will naturally get progressively looser with use, and it helps keep the book sound if this process is evened out throughout the volume.
If you notice a spine starting to become cocked, turn the book upside down and page through it from the back, smoothing the fold or break down as you go.
Careful handling of the binding at all times is important to keep the binding from becoming shaken, but the habit of going through the book front-to-back and then back-to-front a few pages at a time when it's brand new does a lot to help keep the binding healthy for the rest of the book's life.
Note that the terms "cocked" and "shaken" are technical bookseller's terms, not just random descriptive words. Traditionally, most of the terms booksellers use to describe condition have been carefully worked out by tradition and common agreement.
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Original contents copyright 2011 by Michael C. Johnston and/or the bylined author. All Rights Reserved.
Featured Comment by Tom Passin: "As a former hand bookbinder, I applaud your care. The only change I'd suggest is to alternate bunches from front and back, working your way to the middle, as Phil Cook mentioned in the Comments Section. Also, with a fragile book, you might want to not open it all the way for each batch the first time through, but go through it twice before really flattening the pages."