I want to create my page designs in photoshop and then insert the whole page into the click on print software. Your site tells me that a single page (for an A4 landscape book) is 303mmW x 216mmH and a double page is 606mmW x 216mmH. Does this size exclude or include space that will be hidden in the spine? If so how much space should I allow If I am creating a 24 page book? Does your software template allow for what will be hidden in the spine? eg: if I have a full bleed picture will part of it be lost in the spine?