An important factor is what price you want to charge. For POD of the sort produced by Blurb, costs will be very high. I publish books with CreateSpace, part of Amazon. Cheapest is a B&W book, but the quality is too low for a photo book. Color books have much better quality, so I use that even when all of the photos are B&W. But, still, CreateSpace is much, much cheaper than Blurb. If you want the highest quality and also a reasonable price (e.g., <$50), I don't think POD will do.
I suggest you get together a dozen or so sample photos and produce a (color) book with CreateSpace, for which they will charge you zero. All you pay is the cost of the book plus shipping, and it's a really cheap way to see if CreateSpace will work.
Incidentally, CreateSpace is better for me than any other POD publisher because anything you produce is instantly available on Amazon.