![]() However, the approximate compression ratio is 1:2-1:4, depending on image characteristics. Lossless image compression methods preserve all image information and their use is not questioned. Lossless compression eliminates nonessential information in the image while conserving essential data so that the digital image can be reconstructed exactly. There are two methods of image compression: Lossless and lossy. Compressed images need less storage space and decrease the transmission time, since the compressed file is smaller because of the reduced amount of binary data used to represent the image. One method to overcome this transmission overload is to compress the image files. ![]() With increase of digital imaging, the need for storage space and transmission speed also increases. ![]() The development of cost-effective extraoral digital technology, coupled with increased use of computers in orthodontic practice, has made direct digital cephalometric imaging a valid opportunity.
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