Designing Internetworks For Multimedia

As Table indicates, the storage formats deliver different lines of resolution

. Resolution is a measureof an images quality. From the viewers perspective, an image with higher resolution yields sharperpicture quality than a lower resolution image. MCSE Certification

Most consumer televisions display roughly 330 lines of horizontal resolution. Broadcastenvironments typically used high-end cameras to capture video. These cameras and their associatedstorage formats can deliver horizontal resolutions of approximately 700 lines. Each time a copy ismade, the copied image loses some of its resolution.When an image is recorded in high-resolution,multiple generations of the video can be copied without a noticeable difference.

When an image isrecorded in a lower resolution, there is less room to manipulate the image before the viewer noticesthe effects.

Digitizing video involves taking an analog video signal and converting it to a digital video stream

using a video capture board, as shown in Figure 13-4. Today, a variety of computer platforms,

including PC, Macintosh, and UNIX workstations, offer video capture capabilities. In some cases,

though, the capture equipment is a third-party add-on. The analog video source can be stored in anyvideo storage format or it can be a live video feed from a camera. The source can be connected tothe video capture card using any three connectors types (component, S-Video, or composite)

depending on the connector type that the card supports. You can enable compression for a volume when you format it. To enable compression on an existing volume, right-click it and choose MCSE Exam

Properties from the context menu, on theGeneral tab enable the option Compress drive to save disk space. To compress a file or folder, right-click it and choose Properties from the context menu, click the Advanced button and below Compress and Encrypt attributes enable the option Compress contents to save disk space. When you enable compression on a folder or volume, Windows will ask if you want to enable compression for all the files and subfolders in the folder or volume as well. Besides using Windows Exporer, you can also use the command compact to compress or decompress a file or folder.

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