Preguntas más frecuentes (inglés)

¿Qué es Express Server™?

LizardTech Express Server is the only fully scalable Web-based application that offers an end-to-end solution for image and document delivery. It provides a bandwidth-conserving way to put source-quality images and documents online. Easily integrated into your workflow and expanding limitlessly as you grow, Express Server enables your existing hardware to provide instant viewing of images and documents in any environment and to any device-wired or wireless. Express Server delivers source-quality content faster, without necessitating additional bandwidth or hardware.

¿Quién usa Express Server?

LizardTech Express Server is designed for virtually any organization whose infrastructure requires optimization of its existing bandwidth to deliver the highest quality images and documents to its audience.

¿Qué beneficios me aporta Express Server?

Integrated into your company's workflow, LizardTech Express Server enables you to serve unlimited numbers of stunning photographic images in MrSID format and crisp documents in DjVu format-both emerging industry standards. The dramatic file size reductions achieved through these innovative technologies give your users the fastest downloads in the industry, with no loss in visual clarity. Express Server enables you to supply what your customers demand-quality content, fast.

¿Qué es MrSID®?

MrSID is a wavelet-based image format that yields dramatically reduced file sizes with no visible loss in detail. It was originally developed at Los Alamos National Laboratory (LANL) by the same team that created the FBI standard for fingerprint imaging. The name stands for Multiresolution Seamless Image Database. With MrSID a single-source, multiresolution image file serves every imaging need from thumbnail to high-resolution printout, which means storing separate files for different resolution purposes is no longer necessary. You get better use of your storage space and the clearest images in the industry for presenting your content and message to your audience. Your users get lightning-fast downloads-no more long waits for Web pages to load-and crisp images that actually get better with each magnification.

¿Qué es DjVu®?

DjVu is a file format for scanned documents originally developed at AT&T Labs. DjVu files are typically 100 times smaller than PDFs and 1,000 times smaller than TIFF files, and download faster than files in any other document imaging format. DjVu achieves its unparalleled speed through an innovative segmentation process; documents are separated into two layers, one of high-contrast text and line drawings, and another of low-contrast images and color. Each layer is then separately encoded through the technique that yields the greatest reduction in file size. Couple this with the bar-raising sharpness of DjVu documents, and it's no wonder this unique file format is the emerging standard for document management workflows.

¿Cuánto cuesta y dónde puedo comprarlo?

Express Server se licencia en base a cada CPU y módulos escalables de usuarios concurrentes. Contacte con nosotros en 902 102255 para información más precisa

¿Cuáles son los requerimientos del sistema?

Todos los sistemas operativos:

• 1 GB RAM (2 GB recomendados)
• Procesadores Dual (recomendados)
• 100 MB de espacio libre en el disco duro, mas espacio para las imágenes
• Gigabit Ethernet o fibra óptica recomendada para imágenes en sistemas remotos


• Windows™:
  • Microsoft Windows 2000 SP4 o 2003 SP1
  • Procesador Intel Xeon (3+ GHz recomendado)
  • Uno de los siguientes servidores web:
    • IIS 5.0 (2000) o 6.0 (2003)
    • Servidor Web Apache 2.0.46
• Solaris™:
  • Sun Solaris 8, 9 o 10
  • Procesador Sun UltraSPARC IIIi (UltraSPARC IV o superior recomendado)
  • Servidor Web Apache 1.3.x (compilado con soporte Shared Core DSO) o 2.0.46
• Linux™:
  • Red Hat Enterprise Server 3.0 o 4.0
  • Procesador Intel Xeon (3+ GHz recomendado)
  • Servidor Web Apache 1.3.x (compilado con soporte Shared Core DSO) o 2.0.46

¿Qué es IIS?

IIS is Microsoft's Internet Information Server, a Web server that runs on the Windows NT operating system. LizardTech Express Server works with IIS to handle the computationally intensive process of serving images and documents.

¿Qué necesito saber para instalar Express Server?

LizardTech Express Server is distributed as a double-click installation that will perform the majority of the server configuration. You should be the system administrator, but the product is extremely easy to install. Setup can be done by anyone who is proficient in HTML. Also, there are tools available for users who know XML and can work with XSL-based style sheets. The server takes less than 15 minutes to install.

¿Puedo usar directamente imágenes MrSID en HTML?

MrSID imagery in LizardTech Express Server may be requested using a standard universal resource locater (URL). All or part of an image may be statically embedded in an HTML document. More commonly, requests for an image or portion of an image are made using any standard scripting or programming language, such as XSL, ASP, or Javascript.

¿Qué es un Style Server?

Style Server ships with LizardTech Express Server and is the "out of the box" tool for developing HTML, WML and all other XSL-facilitated displays. XSL is used to process the XML output from Express Server into a device-specific language. Express Server ships with XSL style sheets that generate HTML; the end-user can easily create style sheets that generate WML or other device-specific languages. New XSL style sheets may be added and existing style sheets edited without changes to any of the underlying content.

¿Pueden convivir en la misma máquina Style Server y Express Server?

LizardTech Express Server and Style Server can be installed on the same machine, but performance may not be optimal. It is recommended that they remain on separate machines.

¿Funciona el balanceo de carga con Express Server?

If you currently use load balancing on your site to handle Web traffic, you will have no difficulties using LizardTech Express Server in the same environment.

¿Qué tipos de archivos puede servir Express Server?

Currently there are three types of files that can be placed in a catalog and served by LizardTech Express Server: MrSID, DjVu and JPEG. Content Server is prepared to support JPEG 2000 upon its release. Because Content Server can serve JPEG files, it is easy to transition from a JPEG image collection to a quality MrSID or DjVu image collection, maintaining your old materials in the same system in which you create your LizardTech archive.

¿Qué opciones de visualización de imágenes y documentos ofrece Express Server?

Images: Images can be viewed in two ways: with the freely distributed MrSID Browser Plug-in and by non-plug-in means. When any portion of an image is requested, LizardTech Express Server extracts the desired image segment from the MrSID file and decompresses it on the server. If the user is viewing with the MrSID Browser Plug-in, Express Server sends a screen-resolution (72 dots per inch) image of the extracted segment in MrSID format. Because of client-side caching and selective decompression, viewing with the Browser Plug-in decreases processing on the server. It also decreases the number of requests for data because a user navigates a single-source MrSID image. Most plug-in users will find an increase in display speed, as cached data is displayed instantly. For non-plug-in users, Express Server delivers the same extracted screen-resolution segment as a JPEG, which they can view in any standard HTML browser.

MrSID Browser Plug-in is the best viewing option for MrSID files over the Internet. It includes an intuitive user interface and features that can be controlled by the administrator, including 'Print' and 'Save.' The 'Save' function allows screen-resolution (as opposed to original-resolution) MrSID, JPEG and BMP files to be saved from the stored MrSID image. The Browser Plug-in also allows full-page and original-resolution printing of an image directly from the Web. Server administrators concerned with their visitor's ability to print and save high-resolution imagery may configure their LizardTech Express Server to disable these features in the plug-in.

Documents: Documents can be viewed only with the freely distributed DjVu Browser Plug-in. However, unlike other plug-ins such as Acrobat Reader, which is nearly 8MB in size, the DjVu Browser Plug-in is only 1.6MB. Auto-installation also makes it extremely easy for anyone to use.

¿Qué opción de visualización es mejor para imágenes: con plugin o sin plugin?

Both methods work exceptionally well, and each has its benefits. MrSID Browser Plug-in offers better image navigation, provides client-side caching for faster panning and zooming, allows high-resolution printing and offers a defined saving function. The non-plug-in option uses JPEGs created from a MrSID file on the server and therefore does not require the download of a Browser plug-in, the chief advantage being that any HTML browser can view them. However, serving JPEG extractions is more resource intensive and may require more server-side hardware than accommodating the same amount of traffic in clients using the Browser Plug-in. In addition, viewing without a Browser Plug-in allows for only basic navigation and only 72dpi printing.

¿Cuántas KB ocupan los plugins?

• MrSID Browser Plug-in - Auto-install - approx 800KB
• MrSID Browser Plug-in - Manual Install - approx. 1.5MB
• DjVu Browser Plug-in - Auto-install - 1.6MB
• DjVu Browser Plug-in - Manual Install - 1.6MB

¿Qué significa exactamente "auto instalación?

LizardTech Express Server can detect whether or not a user has the MrSID Browser Plug-in and a compatible browser and platform. If the user has a compatible system but does not have the plug-in, the installation process begins by asking if the client would like the plug-in installed. If the client accepts, the installation automatically occurs. If the client does not accept, you can display the image in the non-plug-in viewing mode.

For the DjVu Browser Plug-in, clients are directed to the LizardTech Web site (www.lizardtech.com) for auto-installation.

¿Existe un plugin DjVu para Mac®?

Yes. The DjVu Browser Plug-in for Macintosh is available as a free download at www.lizardtech.com.

¿Los usuarios de Macintosh también aprovechan las ventajas de Express Server?

Macintosh users see the same stunning imagery as do PC users. LizardTech Express Server uses optional style sheets to detect your client's platform and the presence or absence of the MrSID Browser Plug-in (available for both Mac OS and Windows). At your choice, if no plug-in is found Express Server either directs Macintosh OS users to a free manual download of the MrSID Browser Plug-in, or lets the user zoom and pan on the image through any HTML browser. You can also use the non-plug-in option for all Web site visitors. In the non-plug-in option, content is viewable on any operating system and in any Web browser.

¿Qué es exactamente un catálogo?

A catalog is a file-system location containing MrSID images and DjVu documents. If a location has been specified as a catalog, any MrSID images and DjVu documents in this location and its subdirectories can be accessed by queries to the catalog. Catalogs have properties, and these properties control functions such as providing auto-generated thumbnails, disabling the ability to print and save from the MrSID Browser Plug-in and setting maximum resolution for displaying images.

Note: LizardTech Express Server is not a media asset management tool. Instead, it is an image and document access application that allows images and documents to be stored in a flat file system.

¿Qué es un archivo MrSID optimizado?

An optimized MrSID file is one that makes the most efficient possible use of available bandwidth. It is helpful to optimize very large MrSID files for transfer over the Internet. You can do this easily with Streamline, a product included with LizardTech Express Server. Note: Users of optimized MrSID files may notice a slight change in quality. Generally, this change is visually imperceptible, however it is important to maintain the original MrSID images if there is an image quality concern.

¿Qué ventajas tiene usar archivos DjVu con Express Server?

DjVu files work well from any server. However, when delivered through the LizardTech Express Server there are two key advantages:

• the ability to manage files through catalogs.
• the ability to extract text from the Optical Character Recognition (OCR) layer for use in file descriptions.

Including DjVu files in a catalog means they are easily organized along with MrSID images and JPEG files. DjVu files placed in a catalog appear in the hierarchy of images and documents that the users create and display with their customized style sheets. There is no need for separate tools to manage documents and images. Also, sample style sheets, included with Express Server, demonstrate how to pull the first 100 words from the OCR layer of a DjVu file and display that text as a DjVu icon on an HTML page for reference. This is ideal for including additional documents in an existing collection.

¿Dispone Express Server de una herramienta de búsqueda?

Searching MrSID and DjVu files through LizardTech Express Server is not yet possible. Modules are in development that will search the metadata in MrSID images and OCR text in DjVu documents.

¿Qué son los metadados?

Metadata is data about data. Increasingly the term refers to data used to aid in the identification, description and location of networked electronic resources. LizardTech Express Server ships with a product called MUTA (Metadata User Tag Augmenter) that allows customized metadata to be added to a single MrSID file or a series of MrSID files. The metadata can then be accessed by Express Server and displayed. This is useful for creating reference pages that display the thumbnail of an image and include its description, copyright information, etc. This eliminates the need to maintain multiple files, such as thumbnail and description, in order to reference an image.

¿Puede Express Server crear Marcas de Agua ("watermarks") en las imágenes?

LizardTech Express Server supports a visible watermark on MrSID images served to all viewing options. Express Server does not support transparent watermarks. Whether a watermark is added to viewed images, and which image is used as a watermark, is specified catalog by catalog.

¿Puede evitar que los usuarios impriman archivos MrSID?

Yes. To do this, first provide your users with the MrSID Browser Plug-in viewing option. Then set the catalog properties to restrict printing of all or any subset of images. Users are blocked from this feature in the browser and the right click option is grayed out.

¿Puede evitar que los usuarios guarden ("guardar como") los archivos MrSID?

Yes. Using the same method as described above for the 'print' function, you can enable or disable the 'save' function catalog by catalog. The 'save' option becomes grayed out.

¿Es posible descargar una imagen MrSID en su máxima resolución?

Rather than sending the entire file, which wastes bandwidth by delivering more resolution than the user will ever be able view at one time, LizardTech Express Server delivers just the image data a user needs at any given moment, for any given magnification, always at screen resolution. The entire file may be downloaded through FTP or another download method. Express Server does not contain a specific function for downloading an entire MrSID file.

¿Puede proteger la impresión y la descarga mediante contraseñas?

LizardTech Express Server does not support password protection. Neither does it support MrSID images that have been password protected with MrSID Geo.

¿Express Server soporta WML?

LizardTech Express Server can support WML, or Wireless Markup Language, through custom XSL-based style sheets. By creating an XML-to-WML style sheet, you can easily create a page that displays JPEG extractions of MrSID files that work on any WML device. The optional style sheets make it easier to reconfigure display of your content, whether for output in standard HTML, WML or any other XSL-supported language.