My original blurb book was produced with images exported at 72dpi (the aperture default, which I had neglected to check before exporting).
So I re-exported the images at 180 dpi, and re-created the book as a (cheaper) softcover, and sent it off, hoping that it would just work, and I’d be able to take easy advantage of blurbs prices (less then apple) and various book sizes (more than apple).
Sadly, this second blurb book has problems… but different than the first.
The pixelation and lack of detail problems from the (72dpi) book are gone, but instead the details are often muddy, and there is posterization in a lot of the darker areas: the apple books show nice gradations of detail and color, while the blurb books show a monotone blob. Not really very nice.
I hope this is just a color profile issue, or other easily solvable problem, but so far I’ve printed 6 books with the same photos (1 x apple, 2 x blurb, 2 x mypublisher, 1 x viovio), and Apple has the best quality by far, in the easiest possible way.
Apple is also the most expensive, with the fewest book size options, which is why I’m looking around for alternatives.