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DJVU is a file format designed for storing scanned documents, especially those containing a combination of text, line drawings, and photographs. It offers high compression rates, allowing detailed images to be saved in smaller file sizes compared to formats like PDF. Originally developed in the late 1990s by AT&T Labs, DJVU was created to make digitized books and documents more accessible online.
Technically, DJVU uses wavelet compression and JB2 algorithm to compress text and images separately, which enhances efficiency. This separation allows text to be stored as a bitmap mask, while photographs are compressed using lossy methods similar to JPEG2000. It supports multi-page documents and can embed metadata such as OCR text, improving searchability within scanned documents.
DJVU files are commonly used for digitized archival materials such as old newspapers, manuscripts, and ebooks. Many libraries and digital archives prefer DJVU because it preserves image quality while reducing storage needs, making it efficient for online distribution. The format supports layered images, which helps separate text from background for better readability and compression.
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