The .vsd file extension is the default file type associated with Microsoft Visio, a graphic drawing application which forms part of the Microsoft Office product set. As with several other Microsoft file formats, the .vsd extension cannot be read by many other applications. Examples of drawings typically created using Visio are flowcharts, process diagrams and topology diagrams.
.vsd files may contain text, objects and can link to other data sources using the ODBC middleware connection. Whilst the Visio application is relatively expensive, Microsoft offer a freeware application, Microsoft Visio Viewer which allows for .vsd files to be opened effectively in read-only mode. Visio files can also be opened using Microsoft Internet Explorer.
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JPG's are often used for web sites and email as they are generally smaller file sizes as they are lossy meaning that some image quality is lost when the JPG is compressed and saved. The resultant 'lossy' file means that quality can never be recovered. The JPG format is often used in digital camera memory cards. The JPG file is a great format as it often manages to compress files to 1/10 of the size of the original file which is especially good for saving on bandwidth.
JPG is a graphical file format for editing still images, it offers a symmetrical compression technique which is processor intensive and time consiming in both compression and decompression. JPEG is a joint standard of the International Telecommunications Union (ITU-T T.81) and the International Organization for Standardization (ISO 10918-1). JPEG involves a lossy compression mechanism using discrete cosine transform (DCT). Compression rates of 100:1 can be achieved, although the loss is noticeable at that level. Compression rates of 10:1 or 20:1 yield little degradation in image quality.
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