Developed by Microsoft, the .wmf format is a proprietary graphics file type. WMF was first designed to act as a format that allowed vector graphics to be converted to bitmap images and vice versa. The WMF acted as a bridge file, enabling compatibility between the two formats. As new platform independent image formats such as JPEG were developed the need for bridging files such as WMF was removed. The most well known use of the file type is for the early incarnations of clip art that were bundled with Microsoft Office.
A .wmf file may contain both vector graphics and bitmap images to enable portability between two incompatible platforms. The file contains a list of instructions that allows the graphics device to understand how to render the file. It is a 16 bit file.
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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