Screen size comes up a lot with readers, especially when it comes to PDFs and letter or A4 sizes. The article also discusses size discrepancies between readers and paper. I believe that eventually all PDFs will be "tagged" by default, allowing them to reflow on a reader's screen, and solve the PDF problem... or an app will allow users to extract PDF text and save it in a different reader format.
Printers don't simply scale down text in a hardback book's page and reprint it in paperback size... they create a paperback format, which is unique in itself. The development of e-readers suggests that size will be dealt with accordingly. Ultimately, e-formats will be similarly unique, and will not depend on the size of prior printed material. And someone will convert legacy printed material to e-formats, or provide an easy way to do it yourself. After all, that's one of the biggest points to having digital formats.
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