We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
Grainy b&w photos
I have ordered 30 copies of my book and am horrified to see that the photos have been printed in such a way as to appear grainy and with visible lines through them.
The original photos were of high quality - most of them from a photographic agency - but I can't sell my books in this state.
I have raised a ticket with Lulu for some sort of refund - even partial - and will keep you all posted.