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DocumentExpress con DjVu
- Introducción & beneficios
- Flujo de trabajo
- Familia de productos DocumentExpress
- Partners integradores de DjVu
Tecnología DjVu
- Orígenes
- Segmentación en capas
- Compresión y tamaño de archivos
- OCR, indexación y búsqueda de texto
- Visualización web óptima
- DjVu Digital
- DjVu y Open Source
Recursos
Visualizador
Visualizador DjVu
Download
Document Express With DjVu Trial |
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El producto
¿Como se pronuncia DjVu?
DjVu se pronunica "Déjà Vu", como en francés.
¿Porqué tiene este nombre?
El nombre refleja el origen francés de los desarrolladores originales. Significa sus habilidades para capturar y distribuir documentos en papel que "vuelven a tener vida" al estar en formato digital.
¿Porqué debo usar DjVu si ya estoy usando Adobe Acrobat?
Acrobat is a fine product and PDF is a perfectly fine way to store electronic documents for sharing and printing. However, when it comes to scanned documents, in particular color scanned documents, Acrobat does not come close to DocumentExpress with DjVu: with Acrobat 6.0, available since mid-2003, Adobe started supporting wavelet compression as well as a form of segmentation and MRC representation called "Adaptive Compression". However, this compression works rather poorly in our experience, primarily because the segmentation it is based on is very unreliable. In fact, it appears that this segmentation is only able to extract black text from color documents: if your documents contain colored text, or white-on-black text, you are out of luck. The manual for Adobe 6.0 Professional even states: "Note: because adaptive compression may reduce legibility, it should not be applied to documents on which OCR (Paper Capture) is to be applied. If adaptive compression is applied, a higher quality setting should be used." No comments. With Djvu, you get, among others:
- Consistently excellent quality and readability
- No need to fiddle with compression parameters
- Substantially smaller file size that adaptively compressed PDFs
- Much greater OCR accuracy, as a direct result of our superior segmentation technology
¿Porque debo comprar DocumentExpress con DjVu si puedo usar versiones gratuitas y "open source"?
While the open-source version is world class in its abilities to view, print, serve, convert and manipulate Djvu files in various ways, primarily on Linux/Unix platforms, it purposely lacks the ability to encode existing files into DjVu. More exactly, its DjVu encoding abilities are rudimentary and typically only used for testing purposes. After all, we have to make money somewhere! By the way, we also provide Windows desktop applications, integration with commercial OCR engine, and support. Feel free to experiment with DjVuLibre or with our evaluation packages as much as you need, we hope this will convince you that DocumentExpress with DjVu provides the best way to scan, store, and distribute scanned color documents. Additionally, if you need a commercial license to use DjVu within your products, we can provide you with that. If you were to use DjVuLibre instead, which is licensed under the GNU General Public License (GPL), you would then be required to open-source your entire application, something you may find undesirable.
DjVu no es un estandar y esto me pone nervioso. ¿Porqué debo confiar en DjVu?
Well, believe it or not, PDF is not a standard either, and neither are (MS) Word or (Macromedia) Flash. In this day and age, standards are more often defined by the marketplace and the web community at large than by Standards Institutes like the ITU, IETF, or IEEE. As a matter of fact, many of the standards endorsed by these institutes have never been widely supported and accepted: if you had bet on one of these officially endorsed standards, you might be in trouble now! However, you cannot go wrong with DjVu:
- The DjVu format is published and open
- All the technology elements and tools necessary to view, print, and use the DjVu format are available in open-source and also offered for free by LizardTech.
- DjVu is used by millions of users worldwide and can already be considered as a de facto standard for web publication of color document images.
¿Cuáles son las diferencias entre DocumentExpress Desktop y Professional?
How do I decide which one to buy? The Professional version lets you create multi-page DjVu files from scans. It also includes a scriptable DjVu Virtual Printer Driver that enables batch conversion of electronic files to DjVu. If you do not have access to a scanner with document feeder, if you mostly scan single-page documents, or if you convert electronic files to DJVu infrequently, save your money and buy DocumentExpress Desktop. If, on the other hand, you often need to scan multi-page documents or would appreciate the time-saving ability to batch-encode any number of electronic files into DjVu, then DocumentExpress Professional will really be worth your while.
¿DjVu soporta TWAIN? ¿Soporta ISIS?
DocumentExpress Desktop and Professional edition both support TWAIN. As a matter of fact, we are also a member of the TWAIN Working Group. We do not support ISIS at this time, though DocumentExpress Enterprise Edition can easily be integrated to document workflows relying on ISIS for the document capture part.
¿Soporta DjVu carácteres asiáticos?
But of course! As we mentioned in other sections of this web site, the DjVu compression is purely image and shape based, so it works on any kind of documents, whatever the language or alphabet: Asian characters, Russian text, music scores, you name it. However, we are not yet able to generate a hidden text layer for Asian documents. Third-party OCR and text extraction tool should be used for that purpose.
¿En que lenguajes está disponible el plugin DjVu?
Español, Inglés, Japonés, Coreano, Francés y Alemán. Estamos trabajando en más idiomas, por favor visite de nuevo nuestra web porqué tendremos novedades.
No quiero instalar el plugin DjVu para poder ver archivos DjVu. ¿Puedo ver archivos DjVu sin instalar el plugin?
For many users/companies the need to install a plug-in in order to view special file types is a major problem. DjVu files can be viewed without a plug-in using either the LizardTech Express Server or Daeja Systems View One java viewer. The LizardTech ExpressServer can also be used to automate the install of the DjVu plug-in.
¿Existe un visualizador Java para DjVu?
Yes indeed. Our partner Daeja Image Systems offers a commercial Java applet supporting DjVu as well as a number of other formats.
¿Necesito una aplicación de captura de documentos si estoy usando DocumentExpress con DjVu?
Not necessarily. If you use our Desktop or Professional edition, they can interface with any TWAIN compliant scanner or other source, so all you need is a TWAIN compliant scanner. On the other hand, DocumentExpress with DjVu Enterprise Edition is strictly file-based, for ease of integration within any existing scanning workflow, in conjunction with a capture application: it is typically used for large batch compression jobs and takes as input most common file formats, including TIFF, BMP, JPEG, GIF, PICT, PBM, and PNM.
¿Puedo crear archivos DjVu en un Mac?
Currently, DjVu does not support Mac. However, there is no technical reason why we might not support the Mac OS X platform in the future, so keep checking. Alternatively, if you can make a compelling case as to why we should produce a Mac OS X version of DocumentExpress with DjVu please contact us!
¿Solamente puedo convertir a DjVu documentos escaneados?
No, we also offer Virtual Print solutions that can be used on either a client or server and which allow any content that can be printed, to be converted to DjVu. For PDF files we have a specific conversion application that will even preserve hyperlinks and bookmarks and which is ideal for volume conversion of PDF's. See here for more information.
Mi escaner Kodak genera imágenes TIFF de color pequeñas. ¿Me recomiendan usarlas?
Your Kodak scanner achieves this by using JPEG compression within a TIFF file wrapper. This TIFF file type is known as Group 6.
- This TIFF type is not widely supported and is difficult to find viewers for.
- Due to the use of high levels of JPEG compression quality is questionable.
- Finally, it will not be possible to OCR the image.
¿En que sistemas de gestión documental puedo almacenar DjVu?
DjVu files can be stored, searched and viewed in most Document management systems. LizardTech has experience in working with and thus recommends: Filenet, Opentext or Microsoft Sharepoint Portal Server.
¿Como funciona DjVu con los software de captura de documentos?
By allowing you to scan in higher quality and in color, DjVu can often eliminate the majority of clean up normally required and provided by your capture software. Should you need to use capture software, LizardTech recommends and can provide release scripts for Kofax Ascent Capture and Captiva Input Accell.
¿Puedo ver archivos DjVu en dispositivos móviles?
We have a specific viewer for the Pocket PC platform and can support other mobile platforms such as PALM and SYMBIAN using the LizardTech ExpressServer. Due to it's page independent architecture DjVu files give stunning viewing performance across narrow bandwidth networks such as GPRS.
¿Cuáles son las típicas aplicaciones que usan DjVu?
- Accounts payable / invoice management
- Digital Postroom
- Proof of identity
- Application processing
- Corporate acquisitions and due Diligence / audit work
- Technical publications
- Mobile field service
¿Qué beneficios tiene escanear en color?
Color Images Give:
- 14% increase in worker comprehension
- 70% increase in decision-making speed
- 80% improvement in reader recognition (accuracy)
- For your customers / users:
- Information is shared and communicated more accurately and effectively. You'll know what "the yellow highlighted line on the blue form." means!!
- When you send someone a file, it will be identical to the original.
- You don't have to request the original paper copy (if it's even available) in order to decipher information hidden in black and white image capture.
- Call-backs are minimized.
- Documents scanned in color can always be printed in color if necessary, or if it offers a competitive advantage.
Cuestiones técnicas
¿Puedo gestionar los resultados de OCR de un archivo DjVu?
OCR results are stored in the DjVu "hidden text layer". DocumentExpress Enterprise Edition includes tools which enable you to export and import this hidden text layer as XML. Therefore, the best strategy is to export the hidden text to XML, correct it, then re-import it into the DjVu file, and voilà!
¿Porqué algunos colores del documento DjVu difieren de los colores del archivo digital de entrada (PDF u otros)?
The way colors appear on your screen is determined by the color settings in the DjVu plug-in. The plug-in needs to be adjusted to the particular screen you are using to view your DjVu files. To adjust settings, double-click on a DjVu document to start the plug-in, then right-click in the document window and select "Preferences". You will be able to adjust color settings for viewing and printing.
¿Qué formatos de entrada recomienda usar para convertirlos a DjVu?
Any supported image format will work. However, we highly recommend that you do not start from a lossy representation, e.g., a JPEG file or some flavors of PDF. Indeed lossy compression creates artifacts that our DjVu compressor will try very hard to reproduce. This is wasteful and results in lower quality and larger file sizes. In short, your best bet is to start from uncompressed files, such as BMP or uncompressed TIFF files.
¿Cómo puedo visualizar documentos DjVu desde un sistema de gestión documental?
At present, DjVu is natively supported by Computhink's ViewWise and by the Daeja viewer. However, most document management system enable users to specify custom viewing applications. In the case of DjVu, it is only a matter of associating the DjVu extension with its associated viewing application, i.e., our browser plug-in. As a result, we have customers using DjVu within a variety of document management systems, including FileNet, Open Text, Humminbird and others. Please contact us with information on the particular document management system you are using and we will assist you with your DjVu integration.
¿Cómo puedo indexar y bascar archivos DjVu en mi sistema de gestión documental?
This is a no-brainer: DocumentExpress Enterprise Edition comes with tools that let you easily extract the DjVu hidden text layer as XML. This XML data can then easily be used as the basis for an integration with a variety of document management systems. However, if all you need are keyword searches, these XML-based facilities may actually be overkill: you might be better off simply using djvu-to-text, another DocumentExpress Enterprise Edition tool, which simply extracts DjVu hidden text layers as plain text. Finally, let us mention that we have developed a filter that supports Microsoft's iFilter service and is currently undergoing beta-testing. This will provide a way to integrate directly with any Windows Indexing Service application such as Microsoft SharePoint.
¿Puedo incluir funciones de codificación y descodificación en mis aplicaciones?
Yes. You will need to obtain a license for our DocumentExpress with DjVu Encode and Decode SDK. We offer very low cost development license and run-time license agreements for developers who want to add DjVu support to their applications. Please contact us for more information.
¿Puedo integrar DjVu en una aplicación preexistente de captura documental?
There are several ways to do this: you can write simple scripts that call the command line tools of DocumentExpress Enterprise Edition; you can rely on the "watch folder" functionality of the DocumentExpress Enterprise Edition GUI; Or if you need a tighter integration, you can also use our DocumentExpress with DjVu Software Development Kit (SDK). See the DocumentExpress product line section for more information.
He creado varios archivos en el "ordenador A". Se verán igual en el "ordenador B", aunque no tenga instaladas las mismas fuentes de sistema?
YES! DjVu is an image-only format and is completely independent of system fonts. You can be guaranteed that when you create a DjVu file, its appearance will not change on different systems. This is true portability. The same cannot be said of PDF, despite the 'P' in its name...
¿Puedo distribuir el plugin DjVu desde mi web?
Claro que sí! De hecho le animamos a hacerlo. Sólo necesitamos que lo solicite antes por email. De todas formas, lo más sencillo es que haga un link a http://www.lizardtech.es/descargas para tener la última versión en español del plugin DjVu. Si desea distribuir el plugin desde su web, por favor use la icona siguiente:
¿Ofrecen servicios de consultoría e integración?
Yes, LizardTech's consulting team can help you determine what is the best way of integrating DocumentExpress with DjVu to your existing workflow and how to support DjVu files within your applications. Please contact us for more information.
He intentado imprimir un documento DjVu, pero solo he obtenido una página en blanco. ¿Porqué?
It simply means that you tried to print the document using your browser's print menu. The DjVu plug-in does its own rendering and other operations in its own window inside the browser window, but it is still a separate program. To print the DjVu document you are currently viewing using our Windows plugin, either click on the print icon in the DjVu plugin toolbar, or right-click on the document window and select "Print".
Empresa
LizardTech es una empresa relativamente pequeña. ¿Porqué debo invertir en DjVu si en un futuro la empresa puede dejar de existir?
LizardTech is owned by a public Japanese company, Celartem, so we are hoping to stay in business for a very long time! However, this is a fair question and we are glad you asked. This is in large part why we decided to open-source DjVu (see http://djvu.sourceforge.net): should we go out of business, or for some crazy reason, decide not to support DjVu any longer, you can rest assured that the format would survive us. The DjVuLibre package is state-of-the art and comes with all the tools necessary to view, print and manipulate existing DjVu files. The package is available as source as well as binary packages for many platforms, including numerous Unix/Linux flavors, and Windows. In fact, DjVuLibre is already included in a growing list of leading Linux distributions, such as Suse, Debian and several others. In other words, you can be assured that your DjVu investment will not be wasted.
LizardTech Inc acaba de ser adquirida por Celartem. ¿Qué efecto tendrá esto en la empresa? Además, ¿no está Lizardtech básicamente especializada en GIS?
DocumentExpress and DjVu are just as important to us as our geospatial business. If you don't believe us, visit PlanetDjVu or DjVu Zone to read what some prominent DjVu backers have to say about the new direction of the Company and our commitment to DjVu.
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