Что такое DJVU? Объяснение формата изображения документа DjVu
DjVu — это сжатый формат изображения документа, предназначенный для сканированных страниц, книг и документов.
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What is it?
DjVu (pronounced deja vu) is a compressed image format designed primarily for storing scanned documents, especially those combining text, line drawings and photographs. It was developed by researchers at AT&T Labs in the mid-1990s and later commercialized by LizardTech.
DjVu separates a scanned page into layers, typically a high-resolution text/line mask and lower-resolution background and foreground images, then compresses each appropriately. This layered approach produces files that are often much smaller than equivalent PDFs or TIFFs while keeping text sharp.
Technical Specifications
Pros & Cons
Advantages
DjVu's layered compression makes scanned pages far smaller than comparable PDF or TIFF files while keeping text readable.
Separating the text layer preserves crisp characters even at aggressive compression, ideal for scanned books and documents.
The DjVuLibre project provides free, open implementations for creating, viewing and converting DjVu files.
Disadvantages
Most browsers and office apps do not open DjVu natively, so a dedicated viewer or plugin is usually required.
PDF has become the dominant document format, leaving DjVu used mainly in digital libraries and archives.
When to Use It
DjVu is used where scanned documents must stay small yet readable.
Цифровые библиотеки
Archives and libraries store scanned books and journals in DjVu to save space.
Распределение сканированных книг
Large scanned volumes are shared as compact DjVu files for easier download.
Архивирование документов
Historical and technical documents are preserved as space-efficient DjVu scans.
How to open a DJVU file
DJVU files are typically handled by a range of software categorized into professional tools, free or open-source applications, browser-based viewers, and built-in system tools. Professional tools cater to users needing advanced features for editing and managing large document collections, while free and open-source options are ideal for casual users or those on a budget. Browser-based viewers offer convenience for quick access without installation, and built-in tools provide basic functionality for users who may not need extensive features.
When selecting software for DJVU, key decision factors include fidelity in rendering images, the need for editing capabilities versus simple viewing, and the overall cost model of the software. Platform compatibility is also crucial, as some applications are limited to specific operating systems. Users should consider export needs, as converting DJVU files to more common formats may sometimes be the better option, especially if compatibility with other software is required.
DjView 1.0.0
DjView is a dedicated viewer for DJVU files, designed to provide high-quality rendering and navigation through documents. It supports features like text selection and image extraction, making it suitable for users who primarily need to view and interact with DJVU content.
- High-quality image rendering
- Text selection and copying
- Bookmarking and annotation support
- Multi-page document navigation
- Image extraction capabilities
- Open-source and completely free
- Cross-platform compatibility
- Lightweight with fast performance
- Limited editing capabilities
- Basic interface may lack advanced features
Экспортирует в: PDF, PNG, TIFF
Лучше всего для: Choose DjView for a free, efficient viewer focused on high-quality DJVU rendering.
Перейти DjView →WinDjView 2.0
WinDjView is a Windows-specific viewer for DJVU files that offers a user-friendly interface and a range of features tailored for document navigation. It excels in rendering fidelity and includes options for annotations and bookmarks, making it suitable for both casual and professional users.
- Tabbed document interface
- Annotation and highlighting tools
- Full-screen and presentation modes
- Text search functionality
- Automatic updates for new features
- Intuitive user interface
- Robust annotation features
- Fast and responsive performance
- Windows-only platform
- Limited export options compared to others
Экспортирует в: PDF, TIFF
Лучше всего для: WinDjView is ideal for Windows users seeking a feature-rich DJVU viewer with annotation capabilities.
Перейти WinDjView →DjVuLibre 3.5.27
DjVuLibre is a comprehensive toolkit for working with DJVU files, providing both viewing and conversion capabilities. It is particularly useful for users who need to manipulate DJVU documents or convert them into other formats while maintaining high fidelity.
- Command-line tools for batch processing
- High-quality DJVU rendering
- Conversion to PDF and other formats
- Support for OCR (Optical Character Recognition)
- Image compression and optimization tools
- Powerful command-line functionality
- Supports OCR for text extraction
- Flexible for both viewing and editing
- Steeper learning curve for beginners
- Less user-friendly interface
Экспортирует в: PDF, TIFF, PNG, JPG
Лучше всего для: DjVuLibre is best for advanced users needing comprehensive tools for editing and converting DJVU files.
Перейти DjVuLibre →Online DJVU Viewer N/A
Online DJVU Viewer is a web-based tool that allows users to view DJVU files without installing any software. It is convenient for quick access to documents and supports basic navigation features, making it suitable for users who need immediate access to DJVU files.
- Instant access via web browser
- Basic navigation and zooming tools
- No installation required
- Supports multi-page documents
- Compatible with various devices
- No software installation needed
- Accessible from any device
- Quick and easy to use
- Limited features compared to desktop apps
- Dependent on internet connection
Экспортирует в: N/A
Лучше всего для: Use Online DJVU Viewer for quick, hassle-free access to DJVU files without installation.
Перейти Online DJVU Viewer →Convert DJVU Files Free
Use our free online document converter to convert DJVU and other formats - no signup, no watermarks.
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