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Compression rates of 10:1 or 20:1 yield little degradation in image quality.

Compression rates of 100:1 can be achieved, although the loss is noticeable at that level. JPEG involves a lossy compression mechanism using discrete cosine transform (DCT).

JPEG is a joint standard of the International Telecommunications Union (ITU-T T.81) and the International Organization for Standardization (ISO 10918-1). 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. 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. The JPG format is often used in digital camera memory cards. The resultant 'lossy' file means that quality can never be recovered. 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. Various group codes allow for the definition of the start and end points, centre point and extrusion directions. For example there are a large number of group codes related to the creation of an ellipse. The data contained within a DXF is known as tagged data which means that the tags identify how the data should be interpreted. These include the Header which contains file property information, Classes, Tables, Entities, Blocks and Thumbnail Image section. The market leading popularity of AutoCAD has also reduced the requirement for an application independent format.ĭXF files are organised in way that allows the files to be opened by a normal text editor application.vA DXF file has a common format containing a number of sections. However in recent years the usefulness of DXF format has reduced due to DXF not being able to support more advanced CAD elements such as dynamic blocks. This was particularly important for early versions of CAD as reverse engineering of the closely guarded DWG format was limited. The DXF file format was created by Autodesk in 1982 and the intention was to create a format that was independent of CAD applications and therefore eased the difficulties of sharing files created by different applications.

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