Okular
Cos'è Okular?
Okular is a universal document viewer developed by KDE. Okular works on multiple platforms, including but not limited to Linux, Windows, Mac OS X, *BSD, etc.
Puoi seguire lo sviluppo sulla pagina principale del progetto.
Informazioni
Il suo sviluppo è iniziato tramite Google's Summer of Code. La descrizione del progetto è disponibile nel KDE Developer's Corner.
Okular combines the excellent functionalities of KPDF with the versatility of supporting different kinds of documents, like PDF, Postscript, DjVu, CHM, and others.
La pagina dei formati supportati presenta un grafico che descrive in maggior dettaglio i formati supportati e le caratteristiche supportate per ciascuno di essi.
Oltre a supportare molti formati, Okular offre funzionalità come la selezione del testo, la creazione di annotazioni, l'estrazione dei file integrati all'interno di un documento e tante altre sorprese. Schermate di Okular in azione sono visibili qui.
Puoi comunicare con gli sviluppatori e gli altri utenti su IRC, irc.freenode.org, canale #okular.
If you are interested in contributing to Okular, please contact the team. Programmers and non-coders are welcome all the same.
Mobile Version
Okular has a mobile version since version 0.16 release in February 2013 [1]. The first version was based on the active framework. The mobile viewer was then ported to Kirigami in 2016 by Marco Martin[2] and finally to Kirigami2 in 2017[3].
The mobile version doesn't support all features form desktop version, but provide better touch support and a mobile interface.
You can test the mobile version in your PC by entering
okularkirigami
in your terminal.
Consigli e suggerimenti
Reviewing Documents / Annotations
Facendo doppio clic su uno degli strumenti di Revisione (F6) è possibile creare annotazioni multiple senza dover riattivare lo strumento dopo la prima volta.
How to keep the annotations you made to the PDF file:
By default, Okular saves annotations in the local data directory for each user. Since KDE 4.9, it's optionally possible to store them directly in a PDF file by choosing , so they can be seen in other PDF viewers. Note that this feature requires Poppler 0.20 or newer for regular PDF documents. If the PDF document you are annotating is encrypted, this feature requires Poppler 0.22 or newer.
DRM
By default, Okular follow the PDF specification and don't allow copying text from DRM protected files. However, there is an option in the settings to disable DRM limitations in
There was a small controversy in the Debian bug tracker a long time ago, about the default choice to Obey DRM limitations[4][5]. This was then justified by a Okular/KPdf developer[6].
PDF Signature and certificate
Okular can verify if a PDF certificate is valid. But you can not yet create new signature. See release note for more information.
More Information
- Official KDE documentation
- Okular website
- Okular API documentation
- Okular phabricator project
- Okular git repository