The .dwg file extension stands for drawing. One of the oldest file types, it was initially conceived in the 1970s for use with the early Computer Aided Design (CAD) devices for 2D and 3D drawings. The DWG format is licensed to Autodesk for their AutoCAD application which is the de facto standard for CAD drawings. Autodesk have robustly resisted attempts to reverse engineer the DWG format by other freeware applications building watermark protection into certain versions. The DWG files created by CAD applications are used industrially by architects, engineers and designers.
A .DWG file is a binary file that contains vector image data and metadata. The vector image data provides instructions to the CAD application about how to display the DWG on screen. The metadata may contain a variety of information on the file including location specific data and also client data. Files created using AutoCAD 14 also have a file verification checksum included, which validates that the file was created using AutoCAD.
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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