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27 lines
1.3 KiB
Plaintext
27 lines
1.3 KiB
Plaintext
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The Virtual Paper software centers around the notion of a document, which
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generally corresponds to a single paper, report, or book. A document is
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stored as a single file, in a format that we call a "Lectern document". The
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application "BuildLectern" constructs these documents, and "Lectern" lets you
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view them on your computer.
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A Lectern document contains images of each page of the document (at several
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scales), text for the pages (for searching, not for viewing), and global
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information about the document (such as a copy of a PostScript version of the
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document, if available).
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A Lectern document has a fairly simple internal structure. There's an
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internal directory, and a set of components. The components each contain the
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bytes for some part of the overall document: a single page image at a
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particular scale, or the text for a single page, or the PostScript that was
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used to create the document.
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BuildLectern generates a single Lectern document. Its input can be a
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PostScript file, or parts of previously built Lectern documents. Or its
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input can be original raster-based images (such as a set of TIFF files),
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typically at a moderate resolution such as 300 DPI. Finally, BuildLectern's
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input can be a combination of all of these.
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For more information, please see:
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http://www.research.digital.com:80/SRC/virtualpaper
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