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To create a softcover, you must create a file that incorporates the
back cover, spine and front cover in one document. If your book is
going to have a page size that is 6 x 9 for example, the size of the
file you create must be 6 inches wide for the backcover, 6 inches
wide for the front cover plus you must also add the spine size. (The
height of the file will of course be 9). Spine size will vary depending
upon the thickness of the paper you use and the number of pages in
your book. Spine size can be calculated by taking the number of pages
and dividing that number by the PPI of the paper used. PPI refers
to "pages per inch". So if you have a 300 page book and
the paper you use has a PPI of 300, then your spine size will be 300/300
or 1 inch. Add this 1 inch to your front and back cover and you wind
up with a document that is 13 inches wide by 9 inches high.
See the table for popular paper types
ppi.
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