Eyepiece (software)
| eyepiece
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|---|---|
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 Okular shows a PDF document |
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| Basic data
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| Maintainer | The ocular team |
| developer | KDE |
| Current version |
04/20/2 ( June 11, 2020 ) |
| operating system | Unix-like (including FreeBSD , Linux , macOS ), Windows |
| programming language | C ++ |
| category | File viewer |
| License | GPL ( Free Software ) |
| German speaking | Yes |
| okular.kde.org | |
Okular is a universal document viewer . It is distributed as free software under the GNU General Public License (GPL) as part of KDE Applications 5 , builds on KPDF and replaces the individual programs KPDF, KGhostView, KFax, KFaxview, KView and KDVI in KDE SC 4.
development
Okular was launched by Piotr Szymanski at the Google Summer of Code 2005. Compared to KPDF, Okular now also offers a system for bookmarks and annotations, support for forms and multimedia content, multi-column display and the rotation of the pages.
As of version 0.15, comments are saved in the PDF document. This version was released together with KDE 4.9. In previous versions, comments and annotations were not saved directly in the file, but in an external XML file.
The porting to Qt 5 was completed with version 1.0 from December 2016 . The version numbering jumped from 0.26 to 1.0.
Technical details
The program core consists of a library that abstracts the modules for the individual formats. Their functionality can then be used with the associated graphical user interface or simply integrated into other programs.
It supports the following file formats:
- Portable Document Format (PDF) using Poppler
- PostScript using libgs
- Tagged Image File Format (TIFF) using libTIFF
- Compiled HTML Help (CHM) using libCHM
- DjVu using DjVuLibre
- various image formats
- Device independent file format (DVI)
- XML Paper Specification (XPS, OXPS)
- OpenDocument files (ODF)
- EPUB
- FictionBook
- ComicBook
- Mobipocket
- Plucker
- Markdown
user
Since version 6.0 of the LiMux basic client , Okular has replaced the Adobe Acrobat Reader that was previously installed .
See also
Web links
- official website (English)
Individual evidence
- ↑ Okular Homepage / Team (English) - List of all known team members
- ↑ Release 20.04.2 . June 11, 2020 (accessed June 17, 2020).
- ↑ Google Summer of Code 2005 | Google Developers. Retrieved October 19, 2018 .
- ^ Okular - more than a reader - Development News. Retrieved October 19, 2018 .
- ^ Okular - more than a reader - Development News. Retrieved October 20, 2017 .
- ^ Okular - more than a reader - Document format handlers status. Retrieved October 19, 2018 .