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DICOM supports image compression by defining transfer syntaxes which are used for different lossless (bit preserving) and lossy compression schemes. With lossless compression, all original pixel data is recovered and displayed after the image is uncompressed. It means that OnePacs Workstation can display images encoded using all standard DICOM compression techniques.  In cases where the compression is lossless, there is no loss in pixel data of the image and the uncompressed image is bit-for-bit exact replicas of the original image. Unlike lossless compression, Lossy compression does not retain the original pixel data and eliminates some unnecessary and redundant pixel data to reduce the size of the image, so there might be some loss in pixel data after the image is uncompressedof quality.  Lossless compression is 100% reversible, meaning that when the image is uncompressed for display, the resulting image is exactly the same as the original (prior to compression).  Lossy compression doesn't guarantee this.  As the name implies, lossy compression is not reversible, and involves some loss in quality.  Generally, the amount of quality lost is proportional to the amount of compression applied.