While browsing the BookOs.org website, I stumbled on the DjVu file format, which was completely unknown to me. The first version of the file format was released in 1996 and the latest version was updated in 2005.
It's an open file format.
DjVu is a computer file format designed primarily to store scanned documents,
especially those containing a combination of text, line drawings,
indexed color images, and photographs. It uses technologies such as
image layer separation of text and background/images, progressive loading, arithmetic coding, and lossy compression for bitonal (monochrome)
images. This allows for high-quality, readable images to be stored in a
minimum of space, so that they can be made available on the web.
DjVu has been promoted as an alternative to PDF, promising smaller files than PDF for most scanned documents. The DjVu developers report that color magazine pages compress to
40–70 kB, black and white technical papers compress to 15–40 kB, and
ancient manuscripts compress to around 100 kB; a satisfactory JPEG image typically requires 500 kB.[5] Like PDF, DjVu can contain an OCR text layer, making it easy to perform copy and paste and text search operations.
info from: DjVu - Wikipedia, the free encyclopedia
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