To generate a print-on-demand hard-copy of the book, we can use several services. Lulu.com is the largest print-on-demand service, but Amazon provides its own as Createspace.com. After trying to evaluate which of these would be best, it became apparent that we do not need to choose one or the other -- we can do both!
The basic file provided for print-on-demand is a PDF file. PDF is a page-ready format used for documents. PDF files can include text and images. In our case, we can generate our text as images and so have a PDF file that simply contains the correct size and content of images.
An alternative would be to generate a PDF file directly from our representation of the book. Our representation says where each character should be placed. By combining that with the representation of each character in the font definition, we know what image to generate. We can encode this information, in this way, to create a PDF file. PDF files can have embedded fonts, images, and text.
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